diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
index bfb025b5..6814e8a9 100644
--- a/.idea/jarRepositories.xml
+++ b/.idea/jarRepositories.xml
@@ -71,5 +71,15 @@
       <option name="name" value="maven3" />
       <option name="url" value="http://dl.bintray.com/piasy/maven" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="maven2" />
+      <option name="name" value="maven2" />
+      <option name="url" value="https://guardian.github.io/maven/repo-releases/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenLocal" />
+      <option name="name" value="MavenLocal" />
+      <option name="url" value="file:$USER_HOME$/.m2/repository/" />
+    </remote-repository>
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
index 7f68460d..e497da99 100644
--- a/.idea/runConfigurations.xml
+++ b/.idea/runConfigurations.xml
@@ -3,6 +3,7 @@
   <component name="RunConfigurationProducerService">
     <option name="ignoredProducers">
       <set>
+        <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
         <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
         <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
         <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
diff --git a/app/build.gradle b/app/build.gradle
index 6704f213..488a2a6f 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -37,22 +37,22 @@ android {
         applicationId "xyz.quaver.pupil"
         minSdkVersion 16
         targetSdkVersion 30
-        versionCode 64
-        versionName "5.1.7-hotfix1"
+        versionCode 66
+        versionName "5.1.11"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
     buildTypes {
         debug {
-            minifyEnabled true
-            shrinkResources true
+            defaultConfig.minSdkVersion 21
+
+            minifyEnabled false
+            shrinkResources false
 
             debuggable true
             applicationIdSuffix ".debug"
             versionNameSuffix "-DEBUG"
 
-            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro"
-
             ext.enableCrashlytics = false
             ext.alwaysUpdateBuildId = false
         }
@@ -74,44 +74,43 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
-    buildToolsVersion = "29.0.3"
 }
 
 dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar", "*.aar"])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
-    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1"
-    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.0.1"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.3"
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.0"
     
-    implementation "androidx.appcompat:appcompat:1.2.0"
-    implementation "androidx.activity:activity-ktx:1.2.0-beta01"
-    implementation "androidx.fragment:fragment-ktx:1.3.0-beta01"
+    implementation "androidx.appcompat:appcompat:1.3.0"
+    implementation "androidx.activity:activity-ktx:1.3.0-beta01"
+    implementation "androidx.fragment:fragment-ktx:1.3.4"
     implementation "androidx.preference:preference-ktx:1.1.1"
-    implementation "androidx.recyclerview:recyclerview:1.1.0"
+    implementation "androidx.recyclerview:recyclerview:1.2.1"
     implementation "androidx.constraintlayout:constraintlayout:2.0.4"
     implementation "androidx.gridlayout:gridlayout:1.0.0"
-    implementation "androidx.biometric:biometric:1.0.1"
-    implementation "androidx.work:work-runtime-ktx:2.4.0"
+    implementation "androidx.biometric:biometric:1.1.0"
+    implementation "androidx.work:work-runtime-ktx:2.6.0-beta01"
 
     implementation "com.daimajia.swipelayout:library:1.2.0@aar"
 
-    implementation "com.google.android.material:material:1.3.0-alpha04"
+    implementation "com.google.android.material:material:1.3.0"
 
-    implementation "com.google.firebase:firebase-core:18.0.0"
-    implementation "com.google.firebase:firebase-analytics:18.0.0"
-    implementation "com.google.firebase:firebase-crashlytics:17.3.0"
-    implementation "com.google.firebase:firebase-perf:19.0.10"
+    implementation platform('com.google.firebase:firebase-bom:26.5.0')
+    implementation "com.google.firebase:firebase-analytics-ktx"
+    implementation "com.google.firebase:firebase-crashlytics-ktx"
+    implementation "com.google.firebase:firebase-perf-ktx"
 
     implementation "com.google.android.gms:play-services-oss-licenses:17.0.0"
-    implementation "com.google.android.gms:play-services-mlkit-face-detection:16.1.1"
+    implementation "com.google.android.gms:play-services-mlkit-face-detection:16.1.7"
 
     implementation "com.github.clans:fab:1.6.4"
 
     //implementation "com.quiph.ui:recyclerviewfastscroller:0.2.1"
 
-    implementation 'com.github.piasy:BigImageViewer:1.6.7'
-    implementation 'com.github.piasy:FrescoImageLoader:1.6.7'
-    implementation 'com.github.piasy:FrescoImageViewFactory:1.6.7'
+    implementation 'com.github.piasy:BigImageViewer:1.8.0'
+    implementation 'com.github.piasy:FrescoImageLoader:1.8.0'
+    implementation 'com.github.piasy:FrescoImageViewFactory:1.8.0'
 
     //noinspection GradleDependency
     implementation "com.squareup.okhttp3:okhttp:$okhttp_version"
@@ -126,9 +125,9 @@ dependencies {
 
     implementation "ru.noties.markwon:core:3.1.0"
 
-    implementation "xyz.quaver:libpupil:1.8.16"
-    implementation "xyz.quaver:documentfilex:0.4-alpha02"
-    implementation "xyz.quaver:floatingsearchview:1.0.7"
+    implementation "xyz.quaver:libpupil:2.1.4"
+    implementation "xyz.quaver:documentfilex:0.6.1"
+    implementation "xyz.quaver:floatingsearchview:1.1.7"
 
     testImplementation "junit:junit:4.13.1"
     androidTestImplementation "androidx.test.ext:junit:1.1.2"
diff --git a/app/release/output-metadata.json b/app/release/output-metadata.json
index e8294f64..23423f64 100644
--- a/app/release/output-metadata.json
+++ b/app/release/output-metadata.json
@@ -5,13 +5,13 @@
     "kind": "Directory"
   },
   "applicationId": "xyz.quaver.pupil",
-  "variantName": "processReleaseResources",
+  "variantName": "release",
   "elements": [
     {
       "type": "SINGLE",
       "filters": [],
-      "versionCode": 64,
-      "versionName": "5.1.7-hotfix1",
+      "versionCode": 66,
+      "versionName": "5.1.11",
       "outputFile": "app-release.apk"
     }
   ]
diff --git a/app/src/main/java/xyz/quaver/pupil/Pupil.kt b/app/src/main/java/xyz/quaver/pupil/Pupil.kt
index ef94a08c..5c1d169d 100644
--- a/app/src/main/java/xyz/quaver/pupil/Pupil.kt
+++ b/app/src/main/java/xyz/quaver/pupil/Pupil.kt
@@ -26,6 +26,7 @@ import android.content.Context
 import android.content.Intent
 import android.net.Uri
 import android.os.Build
+import android.util.Log
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.content.ContextCompat
 import androidx.preference.PreferenceManager
@@ -34,8 +35,8 @@ import com.github.piasy.biv.loader.fresco.FrescoImageLoader
 import com.google.android.gms.common.GooglePlayServicesNotAvailableException
 import com.google.android.gms.common.GooglePlayServicesRepairableException
 import com.google.android.gms.security.ProviderInstaller
-import com.google.firebase.analytics.FirebaseAnalytics
 import com.google.firebase.crashlytics.FirebaseCrashlytics
+import okhttp3.Dispatcher
 import okhttp3.Interceptor
 import okhttp3.OkHttpClient
 import okhttp3.Response
@@ -46,6 +47,7 @@ import xyz.quaver.pupil.util.downloader.DownloadManager
 import xyz.quaver.setClient
 import java.io.File
 import java.util.*
+import java.util.concurrent.Executors
 import java.util.concurrent.TimeUnit
 import kotlin.reflect.KClass
 
@@ -96,6 +98,11 @@ class Pupil : Application() {
                 val tag = request.tag() ?: return@addInterceptor chain.proceed(request)
 
                 interceptors[tag::class]?.invoke(chain) ?: chain.proceed(request)
+            }.apply {
+                (Preferences.get<String>("max_concurrent_download").toIntOrNull() ?: 0).let {
+                    if (it != 0)
+                        dispatcher(Dispatcher(Executors.newFixedThreadPool(it)))
+                }
             }
 
         try {
@@ -108,8 +115,6 @@ class Pupil : Application() {
 
                 if (!FileX(this, it).canWrite())
                     throw Exception()
-
-                DownloadManager.getInstance(this).migrate()
             }
         } catch (e: Exception) {
             Preferences.remove("download_folder")
diff --git a/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt b/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
index adcd2a36..eb5b2274 100644
--- a/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
+++ b/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
@@ -36,6 +36,7 @@ import com.daimajia.swipe.interfaces.SwipeAdapterInterface
 import com.github.piasy.biv.loader.ImageLoader
 import kotlinx.coroutines.*
 import xyz.quaver.hitomi.getGallery
+import xyz.quaver.hitomi.getGalleryInfo
 import xyz.quaver.hitomi.getReader
 import xyz.quaver.io.util.getChild
 import xyz.quaver.pupil.R
@@ -231,7 +232,7 @@ class GalleryBlockAdapter(private val galleries: List<Int>) : RecyclerSwipeAdapt
             binding.galleryblockPagecount.text = "-"
             CoroutineScope(Dispatchers.IO).launch {
                 val pageCount = kotlin.runCatching {
-                    getReader(galleryBlock.id).galleryInfo.files.size
+                    getGalleryInfo(galleryBlock.id).files.size
                 }.getOrNull() ?: return@launch
                 withContext(Dispatchers.Main) {
                     binding.galleryblockPagecount.text = itemView.context.getString(R.string.galleryblock_pagecount, pageCount)
diff --git a/app/src/main/java/xyz/quaver/pupil/adapters/MirrorAdapter.kt b/app/src/main/java/xyz/quaver/pupil/adapters/MirrorAdapter.kt
deleted file mode 100644
index 93d72678..00000000
--- a/app/src/main/java/xyz/quaver/pupil/adapters/MirrorAdapter.kt
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- *     Pupil, Hitomi.la viewer for Android
- *     Copyright (C) 2020  tom5079
- *
- *     This program is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation, either version 3 of the License, or
- *     (at your option) any later version.
- *
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package xyz.quaver.pupil.adapters
-
-import android.annotation.SuppressLint
-import android.content.Context
-import android.view.LayoutInflater
-import android.view.MotionEvent
-import android.view.ViewGroup
-import androidx.recyclerview.widget.RecyclerView
-import xyz.quaver.pupil.R
-import xyz.quaver.pupil.databinding.MirrorsItemBinding
-import xyz.quaver.pupil.util.Preferences
-import java.util.*
-
-class MirrorAdapter(context: Context) : RecyclerView.Adapter<MirrorAdapter.ViewHolder>() {
-
-    @SuppressLint("ClickableViewAccessibility")
-    inner class ViewHolder(val binding: MirrorsItemBinding) : RecyclerView.ViewHolder(binding.root) {
-        init {
-            binding.mirrorButton.setOnTouchListener { _, event ->
-                if (event.action == MotionEvent.ACTION_DOWN)
-                    onStartDrag?.invoke(this)
-
-                true
-            }
-        }
-        fun bind(mirror: String) {
-            binding.mirrorName.text = mirror
-        }
-    }
-
-    val mirrors = context.resources.getStringArray(R.array.mirrors).map {
-        it.split('|').let { split ->
-            Pair(split.first(), split.last())
-        }
-    }.toMap()
-
-    val list = mirrors.keys.toMutableList().apply {
-        Preferences.get<String>("mirrors")
-            .split(">")
-            .reversed()
-            .forEach {
-                if (this.contains(it)) {
-                    this.remove(it)
-                    this.add(0, it)
-                }
-            }
-    }
-
-    val onItemMove : ((Int, Int) -> Unit) = { from, to ->
-        Collections.swap(list, from, to)
-        notifyItemMoved(from, to)
-        onItemMoved?.invoke(list)
-    }
-    var onStartDrag : ((ViewHolder) -> Unit)? = null
-    var onItemMoved : ((List<String>) -> (Unit))? = null
-
-    @SuppressLint("ClickableViewAccessibility")
-    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
-        holder.bind(mirrors[list.elementAt(position)] ?: error(""))
-    }
-
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
-        return ViewHolder(MirrorsItemBinding.inflate(LayoutInflater.from(parent.context), parent, false))
-    }
-
-    override fun getItemCount() = mirrors.size
-
-}
\ No newline at end of file
diff --git a/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt b/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt
index b815518b..b1b3ebf3 100644
--- a/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt
+++ b/app/src/main/java/xyz/quaver/pupil/adapters/ReaderAdapter.kt
@@ -40,7 +40,7 @@ import com.github.piasy.biv.view.BigImageView
 import com.github.piasy.biv.view.ImageShownCallback
 import com.github.piasy.biv.view.ImageViewFactory
 import kotlinx.coroutines.*
-import xyz.quaver.hitomi.Reader
+import xyz.quaver.hitomi.GalleryInfo
 import xyz.quaver.pupil.R
 import xyz.quaver.pupil.databinding.ReaderItemBinding
 import xyz.quaver.pupil.ui.ReaderActivity
@@ -52,7 +52,7 @@ class ReaderAdapter(
     private val activity: ReaderActivity,
     private val galleryID: Int
 ) : RecyclerView.Adapter<ReaderAdapter.ViewHolder>() {
-    var reader: Reader? = null
+    var galleryInfo: GalleryInfo? = null
 
     var isFullScreen = false
 
@@ -101,7 +101,7 @@ class ReaderAdapter(
                 binding.image.updateLayoutParams<ConstraintLayout.LayoutParams> {
                     height = 0
                     dimensionRatio =
-                        "${reader!!.galleryInfo.files[position].width}:${reader!!.galleryInfo.files[position].height}"
+                        "${galleryInfo!!.files[position].width}:${galleryInfo!!.files[position].height}"
                 }
             } else {
                 binding.root.layoutParams.height = ViewGroup.LayoutParams.MATCH_PARENT
@@ -158,7 +158,7 @@ class ReaderAdapter(
         holder.bind(position)
     }
 
-    override fun getItemCount() = reader?.galleryInfo?.files?.size ?: 0
+    override fun getItemCount() = galleryInfo?.files?.size ?: 0
 
     override fun onViewRecycled(holder: ViewHolder) {
         holder.clear()
diff --git a/app/src/main/java/xyz/quaver/pupil/receiver/UpdateBroadcastReceiver.kt b/app/src/main/java/xyz/quaver/pupil/receiver/UpdateBroadcastReceiver.kt
index badff65e..3097bfae 100644
--- a/app/src/main/java/xyz/quaver/pupil/receiver/UpdateBroadcastReceiver.kt
+++ b/app/src/main/java/xyz/quaver/pupil/receiver/UpdateBroadcastReceiver.kt
@@ -54,7 +54,7 @@ class UpdateBroadcastReceiver : BroadcastReceiver() {
 
                 val uri = downloadManager.query(query).use { cursor ->
                     if (cursor.moveToFirst()) {
-                        cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI)).let {
+                        cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI))?.let {
                             val uri = Uri.parse(it)
 
                             when (uri.scheme) {
diff --git a/app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt b/app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt
index f38ec3e0..20bc08fc 100644
--- a/app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt
+++ b/app/src/main/java/xyz/quaver/pupil/services/DownloadService.kt
@@ -305,10 +305,10 @@ class DownloadService : Service() {
 
         initNotification(galleryID)
 
-        val reader = cache.getReader()
+        val galleryInfo = cache.getGalleryInfo()
 
         // Gallery doesn't exist
-        if (reader == null) {
+        if (galleryInfo == null) {
             delete(galleryID)
             progress[galleryID] = mutableListOf()
             return@launch
@@ -316,7 +316,7 @@ class DownloadService : Service() {
 
         histories.add(galleryID)
 
-        progress[galleryID] = MutableList(reader.galleryInfo.files.size) { 0F }
+        progress[galleryID] = MutableList(galleryInfo.files.size) { 0F }
 
         cache.metadata.imageList?.let {
             it.forEachIndexed { index, image ->
@@ -334,7 +334,7 @@ class DownloadService : Service() {
             return@launch
         }
 
-        notification[galleryID]?.setContentTitle(reader.galleryInfo.title?.ellipsize(30))
+        notification[galleryID]?.setContentTitle(galleryInfo.title?.ellipsize(30))
         notify(galleryID)
 
         val queued = mutableSetOf<Int>()
@@ -348,7 +348,7 @@ class DownloadService : Service() {
             }
         }
 
-        reader.requestBuilders.forEachIndexed { index, it ->
+        galleryInfo.requestBuilders.forEachIndexed { index, it ->
             if (progress[galleryID]?.get(index)?.isInfinite() == false) {
                 val request = it.tag(Tag(galleryID, index, startId)).build()
                 client.newCall(request).enqueue(callback)
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt b/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
index 242f68bd..2962518c 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
@@ -32,7 +32,6 @@ import android.view.animation.DecelerateInterpolator
 import android.widget.EditText
 import android.widget.TextView
 import androidx.appcompat.app.AlertDialog
-import androidx.cardview.widget.CardView
 import androidx.core.content.ContextCompat
 import androidx.core.view.GravityCompat
 import androidx.core.view.ViewCompat
@@ -125,11 +124,10 @@ class MainActivity :
         if (Preferences["download_folder", ""].isEmpty())
             DownloadLocationDialogFragment().show(supportFragmentManager, "Download Location Dialog")
 
-        checkUpdate(this)
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R &&
             !Preferences["download_folder_ignore_warning", false] &&
-            ContextCompat.getExternalFilesDirs(this, null).map { Uri.fromFile(it).toString() }
+            ContextCompat.getExternalFilesDirs(this, null).filterNotNull().map { Uri.fromFile(it).toString() }
                 .contains(Preferences["download_folder", ""])
         ) {
             AlertDialog.Builder(this)
@@ -145,6 +143,12 @@ class MainActivity :
         initView()
     }
 
+    override fun onResume() {
+        super.onResume()
+
+        checkUpdate(this)
+    }
+
     @OptIn(ExperimentalStdlibApi::class)
     override fun onBackPressed() {
         when {
@@ -212,7 +216,7 @@ class MainActivity :
                     min(
                         max(
                         binding.contents.searchview.translationY - dy,
-                        -binding.contents.searchview.findViewById<CardView>(R.id.search_query_section).height.toFloat()
+                        -binding.contents.searchview.binding.querySection.root.height.toFloat()
                     ), 0F)
 
                 if (dy > 0)
@@ -474,7 +478,7 @@ class MainActivity :
         with(binding.contents.searchview) {
             onMenuStatusChangeListener = object: FloatingSearchView.OnMenuStatusChangeListener {
                 override fun onMenuOpened() {
-                    (binding.contents.recyclerview.adapter as GalleryBlockAdapter).closeAllItems()
+                    (this@MainActivity.binding.contents.recyclerview.adapter as GalleryBlockAdapter).closeAllItems()
                 }
 
                 override fun onMenuClosed() {
@@ -558,7 +562,7 @@ class MainActivity :
                 }
             }
 
-            attachNavigationDrawerToMenuButton(binding.drawer)
+            attachNavigationDrawerToMenuButton(this@MainActivity.binding.drawer)
         }
     }
 
@@ -797,7 +801,7 @@ class MainActivity :
                 }
             } catch (e: Exception) {
 
-                if (e.message != "No result")
+                if (e !is CancellationException)
                     FirebaseCrashlytics.getInstance().recordException(e)
 
                 withContext(Dispatchers.Main) {
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt b/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
index 758f8bff..da86a83e 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/ReaderActivity.kt
@@ -49,7 +49,6 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
-import xyz.quaver.Code
 import xyz.quaver.pupil.R
 import xyz.quaver.pupil.adapters.ReaderAdapter
 import xyz.quaver.pupil.databinding.NumberpickerDialogBinding
@@ -184,7 +183,7 @@ class ReaderActivity : BaseActivity() {
 
                 with(binding.numberPicker) {
                     minValue = 1
-                    maxValue = cache.metadata.reader?.galleryInfo?.files?.size ?: 0
+                    maxValue = cache.metadata.galleryInfo?.files?.size ?: 0
                     value = currentPage
                 }
                 val dialog = AlertDialog.Builder(this).apply {
@@ -299,26 +298,19 @@ class ReaderActivity : BaseActivity() {
                     downloader.progress[galleryID]?.count { it.isInfinite() } ?: 0
 
                 if (title == getString(R.string.reader_loading)) {
-                    val reader = cache.metadata.reader
+                    val galleryInfo = cache.metadata.galleryInfo
 
-                    if (reader != null) {
+                    if (galleryInfo != null) {
                         with(binding.recyclerview.adapter as ReaderAdapter) {
-                            this.reader = reader
+                            this.galleryInfo = galleryInfo
                             notifyDataSetChanged()
                         }
 
-                        title = reader.galleryInfo.title
+                        title = galleryInfo.title
                         menu?.findItem(R.id.reader_menu_page_indicator)?.title =
-                            "$currentPage/${reader.galleryInfo.files.size}"
+                            "$currentPage/${galleryInfo.files.size}"
 
-                        menu?.findItem(R.id.reader_type)?.icon = ContextCompat.getDrawable(
-                            this@ReaderActivity,
-                            when (reader.code) {
-                                Code.HITOMI -> R.drawable.hitomi
-                                Code.HIYOBI -> R.drawable.ic_hiyobi
-                                else -> android.R.color.transparent
-                            }
-                        )
+                        menu?.findItem(R.id.reader_type)?.icon = ContextCompat.getDrawable(this@ReaderActivity, R.drawable.hitomi)
                     }
                 }
 
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/dialog/DownloadLocationDialogFragment.kt b/app/src/main/java/xyz/quaver/pupil/ui/dialog/DownloadLocationDialogFragment.kt
index 7e61be12..e6a03cff 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/dialog/DownloadLocationDialogFragment.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/dialog/DownloadLocationDialogFragment.kt
@@ -39,7 +39,6 @@ import xyz.quaver.pupil.databinding.DownloadLocationItemBinding
 import xyz.quaver.pupil.util.Preferences
 import xyz.quaver.pupil.util.byteToString
 import xyz.quaver.pupil.util.downloader.DownloadManager
-import xyz.quaver.pupil.util.migrate
 import java.io.File
 
 class DownloadLocationDialogFragment : DialogFragment() {
@@ -76,6 +75,15 @@ class DownloadLocationDialogFragment : DialogFragment() {
                     if (key == null) entries[key]!!.locationAvailable.text = downloadFolder
                 }
             }
+        } else {
+            val downloadFolder = DownloadManager.getInstance(context ?: return@registerForActivityResult).downloadFolder.canonicalPath
+            val key = entries.keys.firstOrNull { it?.canonicalPath == downloadFolder }
+            if (key == null)
+                entries[key]!!.locationAvailable.text = downloadFolder
+            else {
+                entries[null]!!.button.isChecked = false
+                entries[key]!!.button.isChecked = true
+            }
         }
     }
 
@@ -121,8 +129,8 @@ class DownloadLocationDialogFragment : DialogFragment() {
                     byteToString(dir.freeSpace)
                 )
                 root.setOnClickListener {
-                    entries.values.forEach { _ ->
-                        button.isChecked = false
+                    entries.values.forEach { entry ->
+                        entry.button.isChecked = false
                     }
                     button.performClick()
                     Preferences["download_folder"] = dir.toUri().toString()
@@ -134,8 +142,8 @@ class DownloadLocationDialogFragment : DialogFragment() {
         DownloadLocationItemBinding.inflate(layoutInflater, binding.root, true).apply {
             locationType.text = requireContext().getString(R.string.settings_download_folder_custom)
             root.setOnClickListener {
-                entries.values.forEach {
-                    it.button.isChecked = false
+                entries.values.forEach { entry ->
+                    entry.button.isChecked = false
                 }
                 button.performClick()
 
@@ -178,8 +186,6 @@ class DownloadLocationDialogFragment : DialogFragment() {
             setPositiveButton(requireContext().getText(android.R.string.ok)) { _, _ ->
                 if (Preferences["download_folder", ""].isEmpty())
                     Preferences["download_folder"] = context.getExternalFilesDir(null)?.toUri()?.toString() ?: ""
-
-                DownloadManager.getInstance(requireContext()).migrate()
             }
 
             isCancelable = false
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/dialog/MirrorDialog.kt b/app/src/main/java/xyz/quaver/pupil/ui/dialog/MirrorDialog.kt
deleted file mode 100644
index aafb58d0..00000000
--- a/app/src/main/java/xyz/quaver/pupil/ui/dialog/MirrorDialog.kt
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- *     Pupil, Hitomi.la viewer for Android
- *     Copyright (C) 2020  tom5079
- *
- *     This program is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation, either version 3 of the License, or
- *     (at your option) any later version.
- *
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-package xyz.quaver.pupil.ui.dialog
-
-import android.annotation.SuppressLint
-import android.app.Dialog
-import android.content.Context
-import android.os.Bundle
-import android.view.View
-import androidx.appcompat.app.AlertDialog
-import androidx.recyclerview.widget.DividerItemDecoration
-import androidx.recyclerview.widget.ItemTouchHelper
-import androidx.recyclerview.widget.LinearLayoutManager
-import androidx.recyclerview.widget.RecyclerView
-import xyz.quaver.pupil.R
-import xyz.quaver.pupil.adapters.MirrorAdapter
-import xyz.quaver.pupil.util.Preferences
-
-class MirrorDialog(context: Context) : AlertDialog(context) {
-
-    class ItemTouchHelperCallback : ItemTouchHelper.Callback() {
-
-        var onMoveItem : ((Int, Int) -> (Unit))? = null
-
-        override fun getMovementFlags(
-            recyclerView: RecyclerView,
-            viewHolder: RecyclerView.ViewHolder
-        ) = makeMovementFlags(ItemTouchHelper.UP or ItemTouchHelper.DOWN, 0)
-
-        override fun onMove(
-            recyclerView: RecyclerView,
-            viewHolder: RecyclerView.ViewHolder,
-            target: RecyclerView.ViewHolder
-        ): Boolean {
-            onMoveItem?.invoke(viewHolder.adapterPosition, target.adapterPosition)
-            return true
-        }
-
-        override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
-
-        }
-    }
-
-    @SuppressLint("InflateParams")
-    override fun onCreate(savedInstanceState: Bundle?) {
-        setTitle(R.string.settings_mirror_title)
-        setView(build())
-        setButton(Dialog.BUTTON_POSITIVE, context.getString(android.R.string.ok)) { _, _ -> }
-
-        super.onCreate(savedInstanceState)
-    }
-
-    private fun build() : View {
-        return RecyclerView(context).apply recyclerview@{
-            addItemDecoration(DividerItemDecoration(context, DividerItemDecoration.VERTICAL))
-            layoutManager = LinearLayoutManager(context)
-            adapter = MirrorAdapter(context).apply adapter@{
-                val itemTouchHelper = ItemTouchHelper(ItemTouchHelperCallback().apply {
-                    onMoveItem = this@adapter.onItemMove
-                }).apply {
-                    attachToRecyclerView(this@recyclerview)
-                }
-
-                onStartDrag = {
-                    itemTouchHelper.startDrag(it)
-                }
-
-                onItemMoved = {
-                    Preferences["mirrors"] = it.joinToString(">")
-                }
-            }
-        }
-    }
-
-}
\ No newline at end of file
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialog.kt b/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialogFragment.kt
similarity index 85%
rename from app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialog.kt
rename to app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialogFragment.kt
index c0d4a093..8cce55ea 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialog.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/dialog/ProxyDialogFragment.kt
@@ -18,12 +18,14 @@
 
 package xyz.quaver.pupil.ui.dialog
 
+import android.app.Dialog
 import android.content.Context
 import android.os.Bundle
 import android.view.View
 import android.widget.AdapterView
 import android.widget.ArrayAdapter
 import androidx.appcompat.app.AlertDialog
+import androidx.fragment.app.DialogFragment
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import xyz.quaver.pupil.R
@@ -37,17 +39,19 @@ import xyz.quaver.pupil.util.getProxyInfo
 import xyz.quaver.pupil.util.proxyInfo
 import java.net.Proxy
 
-class ProxyDialog(context: Context) : AlertDialog(context) {
+class ProxyDialogFragment : DialogFragment() {
 
-    private lateinit var binding: ProxyDialogBinding
+    private var _binding: ProxyDialogBinding? = null
+    private val binding get() = _binding!!
 
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-
-        binding = ProxyDialogBinding.inflate(layoutInflater)
-        setView(binding.root)
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        _binding = ProxyDialogBinding.inflate(layoutInflater)
 
         initView()
+
+        return AlertDialog.Builder(requireContext()).apply {
+            setView(binding.root)
+        }.create()
     }
 
     private fun initView() {
@@ -105,9 +109,9 @@ class ProxyDialog(context: Context) : AlertDialog(context) {
 
             if (type != Proxy.Type.DIRECT) {
                 if (addr == null || addr.isEmpty())
-                    binding.addr.error = context.getText(R.string.proxy_dialog_error)
+                    binding.addr.error = requireContext().getText(R.string.proxy_dialog_error)
                 if (port == null)
-                    binding.port.error = context.getText(R.string.proxy_dialog_error)
+                    binding.port.error = requireContext().getText(R.string.proxy_dialog_error)
 
                 if (addr == null || addr.isEmpty() || port == null)
                     return@setOnClickListener
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt b/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt
index bef1ec55..e6c40d39 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/fragment/SettingsFragment.kt
@@ -29,15 +29,20 @@ import com.google.android.gms.oss.licenses.OssLicensesMenuActivity
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import okhttp3.Dispatcher
 import xyz.quaver.io.FileX
 import xyz.quaver.io.util.getChild
 import xyz.quaver.pupil.R
+import xyz.quaver.pupil.client
+import xyz.quaver.pupil.clientBuilder
+import xyz.quaver.pupil.clientHolder
 import xyz.quaver.pupil.ui.LockActivity
 import xyz.quaver.pupil.ui.SettingsActivity
 import xyz.quaver.pupil.ui.dialog.*
 import xyz.quaver.pupil.util.*
 import xyz.quaver.pupil.util.downloader.DownloadManager
 import java.util.*
+import java.util.concurrent.Executors
 
 class SettingsFragment :
     PreferenceFragmentCompat(),
@@ -98,13 +103,8 @@ class SettingsFragment :
                     }
                     lockLauncher.launch(intent)
                 }
-                "mirrors" -> {
-                    MirrorDialog(requireContext())
-                        .show()
-                }
                 "proxy" -> {
-                    ProxyDialog(requireContext())
-                        .show()
+                    ProxyDialogFragment().show(parentFragmentManager, "Proxy Dialog")
                 }
                 "user_id" -> {
                     (context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager).setPrimaryClip(
@@ -168,6 +168,18 @@ class SettingsFragment :
                 "download_folder_name" -> {
                     summary = Preferences["download_folder_name", "[-id-] -title-"]
                 }
+                "max_concurrent_download" -> {
+                    val newValue = Preferences.get<String>(key).toIntOrNull() ?: 0
+
+                    if (newValue == 0)
+                        clientBuilder.dispatcher(Dispatcher())
+                    else
+                        clientBuilder.dispatcher((Dispatcher(Executors.newFixedThreadPool(newValue))))
+
+                    clientHolder = null
+                    client
+                }
+                else -> return
             }
         }
     }
@@ -247,6 +259,11 @@ class SettingsFragment :
 
                             onPreferenceClickListener = this@SettingsFragment
                         }
+                        "proxy" -> {
+                            summary = getProxyInfo().type.name
+
+                            onPreferenceClickListener = this@SettingsFragment
+                        }
                         "tag_translation" -> {
                             this as ListPreference
 
@@ -268,14 +285,6 @@ class SettingsFragment :
                             onPreferenceChangeListener = this@SettingsFragment
 
                         }
-                        "mirrors" -> {
-                            onPreferenceClickListener = this@SettingsFragment
-                        }
-                        "proxy" -> {
-                            summary = getProxyInfo().type.name
-
-                            onPreferenceClickListener = this@SettingsFragment
-                        }
                         "dark_mode" -> {
                             onPreferenceChangeListener = this@SettingsFragment
                         }
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/view/FloatingSearchView.kt b/app/src/main/java/xyz/quaver/pupil/ui/view/FloatingSearchView.kt
index 3e922ba1..93fea583 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/view/FloatingSearchView.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/view/FloatingSearchView.kt
@@ -59,8 +59,8 @@ class FloatingSearchView @JvmOverloads constructor(context: Context, attrs: Attr
 
         searchInputView.addTextChangedListener(this)
         onSearchListener = this
-        onBindSuggestionCallback = { a, b, c, d, e ->
-            onBindSuggestion(a, b, c, d, e)
+        onBindSuggestionCallback = { binding, item, itemPosition ->
+            onBindSuggestion(binding.root, binding.leftIcon, binding.body, item, itemPosition)
         }
     }
 
diff --git a/app/src/main/java/xyz/quaver/pupil/util/SavedSet.kt b/app/src/main/java/xyz/quaver/pupil/util/SavedSet.kt
index 6e2c0987..710fe184 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/SavedSet.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/SavedSet.kt
@@ -18,11 +18,13 @@
 
 package xyz.quaver.pupil.util
 
-import kotlinx.serialization.*
+import com.google.firebase.crashlytics.FirebaseCrashlytics
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.KSerializer
 import kotlinx.serialization.builtins.ListSerializer
 import kotlinx.serialization.json.Json
+import kotlinx.serialization.serializer
 import java.io.File
-import java.util.*
 
 class SavedSet <T: Any> (private val file: File, private val any: T, private val set: MutableSet<T> = mutableSetOf()) : MutableSet<T> by set {
 
@@ -46,6 +48,8 @@ class SavedSet <T: Any> (private val file: File, private val any: T, private val
             Json.decodeFromString(serializer, file.readText())
         }.onSuccess {
             set.addAll(it)
+        }.onFailure {
+            FirebaseCrashlytics.getInstance().recordException(it)
         }
     }
 
@@ -57,8 +61,6 @@ class SavedSet <T: Any> (private val file: File, private val any: T, private val
 
     @Synchronized
     override fun add(element: T): Boolean {
-        load()
-
         set.remove(element)
 
         return set.add(element).also {
@@ -68,8 +70,6 @@ class SavedSet <T: Any> (private val file: File, private val any: T, private val
 
     @Synchronized
     override fun addAll(elements: Collection<T>): Boolean {
-        load()
-
         set.removeAll(elements)
 
         return set.addAll(elements).also {
@@ -79,8 +79,6 @@ class SavedSet <T: Any> (private val file: File, private val any: T, private val
 
     @Synchronized
     override fun remove(element: T): Boolean {
-        load()
-
         return set.remove(element).also {
             save()
         }
diff --git a/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt b/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt
index 60d8ef25..4aa9b0df 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt
@@ -32,24 +32,62 @@ import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import okhttp3.Request
-import xyz.quaver.Code
 import xyz.quaver.hitomi.GalleryBlock
-import xyz.quaver.hitomi.Reader
+import xyz.quaver.hitomi.GalleryInfo
 import xyz.quaver.io.FileX
 import xyz.quaver.io.util.*
 import xyz.quaver.pupil.client
-import xyz.quaver.pupil.util.Preferences
 import java.io.File
 import java.io.IOException
 import java.util.concurrent.ConcurrentHashMap
 
 @Serializable
-data class Metadata(
-    var galleryBlock: GalleryBlock? = null,
-    var reader: Reader? = null,
+data class OldGalleryBlock(
+    val code: String,
+    val id: Int,
+    val galleryUrl: String,
+    val thumbnails: List<String>,
+    val title: String,
+    val artists: List<String>,
+    val series: List<String>,
+    val type: String,
+    val language: String,
+    val relatedTags: List<String>
+)
+
+@Serializable
+data class OldReader(val code: String, val galleryInfo: GalleryInfo)
+
+@Serializable
+data class OldMetadata(
+    var galleryBlock: OldGalleryBlock? = null,
+    var reader: OldReader? = null,
     var imageList: MutableList<String?>? = null
 ) {
-    fun copy(): Metadata = Metadata(galleryBlock, reader, imageList?.let { MutableList(it.size) { i -> it[i] } })
+    fun copy(): OldMetadata = OldMetadata(galleryBlock, reader, imageList?.let { MutableList(it.size) { i -> it[i] } })
+}
+
+@Serializable
+data class Metadata(
+    var galleryBlock: GalleryBlock? = null,
+    var galleryInfo: GalleryInfo? = null,
+    var imageList: MutableList<String?>? = null
+) {
+    constructor(old: OldMetadata) : this(old.galleryBlock?.let { galleryBlock -> GalleryBlock(
+        galleryBlock.id,
+        galleryBlock.galleryUrl,
+        galleryBlock.thumbnails,
+        galleryBlock.title,
+        galleryBlock.artists,
+        galleryBlock.series,
+        galleryBlock.type,
+        galleryBlock.language,
+        galleryBlock.relatedTags) },
+        old.reader?.galleryInfo,
+        old.imageList
+    )
+
+    fun copy(): Metadata = Metadata(galleryBlock, galleryInfo, imageList?.let { MutableList(it.size) { i -> it[i] } })
 }
 
 class Cache private constructor(context: Context, val galleryID: Int) : ContextWrapper(context) {
@@ -74,8 +112,12 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
     }
 
     var metadata = kotlin.runCatching {
-        findFile(".metadata")?.readText()?.let {
-            Json.decodeFromString<Metadata>(it)
+        findFile(".metadata")?.readText()?.let { metadata ->
+            kotlin.runCatching {
+                Json.decodeFromString<Metadata>(metadata)
+            }.getOrElse {
+                Metadata(Json.decodeFromString<OldMetadata>(metadata))
+            }
         }
     }.getOrNull() ?: Metadata()
 
@@ -110,27 +152,13 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
     }
 
     suspend fun getGalleryBlock(): GalleryBlock? {
-        val sources = listOf(
-            { xyz.quaver.hitomi.getGalleryBlock(galleryID) },
-            { xyz.quaver.hiyobi.getGalleryBlock(galleryID) }
-        )
-
         return metadata.galleryBlock
             ?: withContext(Dispatchers.IO) {
-                var galleryBlock: GalleryBlock? = null
-
-                for (source in sources) {
-                    galleryBlock = try {
-                        source.invoke()
-                    } catch (e: Exception) { null }
-
-                    if (galleryBlock != null)
-                        break
-                }
-
-                galleryBlock?.also {
-                    setMetadata { metadata -> metadata.galleryBlock = it }
-                }
+                try {
+                    xyz.quaver.hitomi.getGalleryBlock(galleryID).also {
+                        setMetadata { metadata -> metadata.galleryBlock = it }
+                    }
+                } catch (e: Exception) { return@withContext null }
             }
     }
 
@@ -154,41 +182,21 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
                 }.getOrNull()?.uri }
             } } ?: Uri.EMPTY
 
-    suspend fun getReader(): Reader? {
-        val mirrors = Preferences.get<String>("mirrors").let { if (it.isEmpty()) emptyList() else it.split('>') }
+    suspend fun getGalleryInfo(): GalleryInfo? {
 
-        val sources = mapOf(
-            Code.HITOMI to { xyz.quaver.hitomi.getReader(galleryID) },
-            Code.HIYOBI to { xyz.quaver.hiyobi.getReader(galleryID) }
-        ).let {
-            if (mirrors.isNotEmpty())
-                it.toSortedMap{ o1, o2 -> mirrors.indexOf(o1.name) - mirrors.indexOf(o2.name) }
-            else
-                it
-        }
-
-        return metadata.reader
+        return metadata.galleryInfo
             ?: withContext(Dispatchers.IO) {
-                var reader: Reader? = null
+                try {
+                    xyz.quaver.hitomi.getGalleryInfo(galleryID).also {
+                        setMetadata { metadata ->
+                            metadata.galleryInfo = it
 
-                for (source in sources) {
-                    reader = try {
-                        source.value.invoke()
-                    } catch (e: Exception) {
-                        null
-                    }
-
-                   if (reader != null)
-                       break
-                }
-
-                reader?.also {
-                    setMetadata { metadata ->
-                        metadata.reader = it
-
-                        if (metadata.imageList == null)
-                            metadata.imageList = MutableList(reader.galleryInfo.files.size) { null }
+                            if (metadata.imageList == null)
+                                metadata.imageList = MutableList(it.files.size) { null }
+                        }
                     }
+                } catch (e: Exception) {
+                    null
                 }
             }
     }
diff --git a/app/src/main/java/xyz/quaver/pupil/util/misc.kt b/app/src/main/java/xyz/quaver/pupil/util/misc.kt
index 5aba4d89..b0d040cb 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/misc.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/misc.kt
@@ -19,19 +19,13 @@
 package xyz.quaver.pupil.util
 
 import android.annotation.SuppressLint
-import android.content.Context
-import android.content.Intent
-import android.os.Build
-import androidx.core.content.ContextCompat
 import kotlinx.serialization.json.*
 import okhttp3.OkHttpClient
 import okhttp3.Request
-import xyz.quaver.Code
 import xyz.quaver.hitomi.GalleryBlock
-import xyz.quaver.hitomi.Reader
+import xyz.quaver.hitomi.GalleryInfo
 import xyz.quaver.hitomi.getReferer
 import xyz.quaver.hitomi.imageUrlFromImage
-import xyz.quaver.hiyobi.createImgList
 import java.util.*
 import kotlin.collections.ArrayList
 
@@ -41,7 +35,7 @@ fun String.wordCapitalize() : String {
 
     @SuppressLint("DefaultLocale")
     for (word in this.split(" "))
-        result.add(word.capitalize(Locale.US))
+        result.add(word.replaceFirstChar { if (it.isLowerCase()) it.titlecase(Locale.US) else it.toString() })
 
     return result.joinToString(" ")
 }
@@ -103,25 +97,15 @@ fun GalleryBlock.formatDownloadFolderTest(format: String): String =
         }
     }.replace(Regex("""[*\\|"?><:/]"""), "").ellipsize(127)
 
-val Reader.requestBuilders: List<Request.Builder>
+val GalleryInfo.requestBuilders: List<Request.Builder>
     get() {
-        val galleryID = this.galleryInfo.id ?: 0
+        val galleryID = this.id ?: 0
         val lowQuality = Preferences["low_quality", true]
 
-        return when(code) {
-            Code.HITOMI -> {
-                this.galleryInfo.files.map {
-                    Request.Builder()
-                        .url(imageUrlFromImage(galleryID, it, !lowQuality))
-                        .header("Referer", getReferer(galleryID))
-                }
-            }
-            Code.HIYOBI -> {
-                createImgList(galleryID, this, lowQuality).map {
-                    Request.Builder()
-                        .url(it.path)
-                }
-            }
+        return this.files.map {
+            Request.Builder()
+                .url(imageUrlFromImage(galleryID, it, !lowQuality))
+                .header("Referer", getReferer(galleryID))
         }
     }
 
diff --git a/app/src/main/java/xyz/quaver/pupil/util/update.kt b/app/src/main/java/xyz/quaver/pupil/util/update.kt
index e8e3bb90..b97ca4b2 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/update.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/update.kt
@@ -18,48 +18,26 @@
 
 package xyz.quaver.pupil.util
 
-import android.annotation.SuppressLint
 import android.app.DownloadManager
-import android.app.PendingIntent
-import android.content.BroadcastReceiver
 import android.content.Context
-import android.content.Intent
-import android.content.IntentFilter
 import android.net.Uri
-import android.util.Base64
 import android.webkit.URLUtil
 import androidx.appcompat.app.AlertDialog
-import androidx.core.app.NotificationCompat
-import androidx.core.app.NotificationManagerCompat
 import androidx.preference.PreferenceManager
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 import kotlinx.serialization.decodeFromString
-import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.*
 import okhttp3.Call
 import okhttp3.Callback
 import okhttp3.Request
 import okhttp3.Response
 import ru.noties.markwon.Markwon
-import xyz.quaver.hitomi.GalleryBlock
-import xyz.quaver.hitomi.Reader
-import xyz.quaver.hitomi.getGalleryBlock
-import xyz.quaver.hitomi.getReader
-import xyz.quaver.io.FileX
-import xyz.quaver.io.util.getChild
-import xyz.quaver.io.util.readText
-import xyz.quaver.io.util.writeBytes
-import xyz.quaver.io.util.writeText
 import xyz.quaver.pupil.BuildConfig
 import xyz.quaver.pupil.R
 import xyz.quaver.pupil.client
 import xyz.quaver.pupil.favorites
-import xyz.quaver.pupil.services.DownloadService
-import xyz.quaver.pupil.util.downloader.Cache
-import xyz.quaver.pupil.util.downloader.Metadata
 import java.io.File
 import java.io.IOException
 import java.net.URL
@@ -220,127 +198,4 @@ fun restore(url: String, onFailure: ((Throwable) -> Unit)? = null, onSuccess: ((
             }.onFailure { onFailure?.invoke(it) }
         }
     })
-}
-
-private var job: Job? = null
-private val receiver = object: BroadcastReceiver() {
-    val ACTION_CANCEL = "ACTION_IMPORT_CANCEL"
-    override fun onReceive(context: Context?, intent: Intent?) {
-        context ?: return
-
-        when (intent?.action) {
-            ACTION_CANCEL -> {
-                job?.cancel()
-                NotificationManagerCompat.from(context).cancel(R.id.notification_id_import)
-                context.unregisterReceiver(this)
-            }
-        }
-    }
-}
-@SuppressLint("RestrictedApi")
-fun xyz.quaver.pupil.util.downloader.DownloadManager.migrate() {
-    registerReceiver(receiver, IntentFilter().apply { addAction(receiver.ACTION_CANCEL) })
-
-    val notificationManager = NotificationManagerCompat.from(this)
-    val action = NotificationCompat.Action.Builder(0, getText(android.R.string.cancel),
-        PendingIntent.getBroadcast(this, R.id.notification_import_cancel_action.normalizeID(), Intent(receiver.ACTION_CANCEL), PendingIntent.FLAG_UPDATE_CURRENT)
-    ).build()
-    val notification = NotificationCompat.Builder(this, "import")
-        .setContentTitle(getText(R.string.import_old_galleries_notification))
-        .setProgress(0, 0, true)
-        .addAction(action)
-        .setSmallIcon(R.drawable.ic_notification)
-        .setOngoing(true)
-
-    DownloadService.cancel(this)
-
-    job?.cancel()
-    job = CoroutineScope(Dispatchers.IO).launch {
-        val images = listOf(
-            "jpg",
-            "png",
-            "gif",
-            "webp"
-        )
-
-        val downloadFolders = downloadFolder.listFiles { folder ->
-            folder.isDirectory && !downloadFolderMap.values.contains(folder.name)
-        }?.map {
-            if (it !is FileX)
-                FileX(this@migrate, it)
-            else
-                it
-        }
-
-        if (downloadFolders.isNullOrEmpty()) return@launch
-
-        downloadFolders.forEachIndexed { index, folder ->
-            notification
-                .setContentText(getString(R.string.import_old_galleries_notification_text, index, downloadFolders.size))
-                .setProgress(index, downloadFolders.size, false)
-            notificationManager.notify(R.id.notification_id_import, notification.build())
-
-            val metadata = kotlin.runCatching {
-                folder.getChild(".metadata").readText()?.let { Json.parseToJsonElement(it) }
-            }.getOrNull()
-
-            val galleryID = metadata?.getOrNull("reader")?.getOrNull("galleryInfo")?.getOrNull("id")?.content?.toIntOrNull()
-                ?: folder.name.toIntOrNull() ?: return@forEachIndexed
-
-            val galleryBlock: GalleryBlock? = kotlin.runCatching {
-                metadata?.getOrNull("galleryBlock")?.let { Json.decodeFromJsonElement<GalleryBlock>(it) }
-            }.getOrNull() ?: kotlin.runCatching {
-                getGalleryBlock(galleryID)
-            }.getOrNull() ?: kotlin.runCatching {
-                xyz.quaver.hiyobi.getGalleryBlock(galleryID)
-            }.getOrNull()
-
-            val reader: Reader? = kotlin.runCatching {
-                metadata?.getOrNull("reader")?.let { Json.decodeFromJsonElement<Reader>(it) }
-            }.getOrNull() ?: kotlin.runCatching {
-                getReader(galleryID)
-            }.getOrNull() ?: kotlin.runCatching {
-                xyz.quaver.hiyobi.getReader(galleryID)
-            }.getOrNull()
-
-            metadata?.getOrNull("thumbnail")?.jsonPrimitive?.contentOrNull?.also { thumbnail ->
-                val file = folder.getChild(".thumbnail").also {
-                    if (it.exists())
-                        it.delete()
-                    it.createNewFile()
-                }
-
-                file.writeBytes(Base64.decode(thumbnail, Base64.DEFAULT))
-            }
-
-            val list: MutableList<String?> =
-                MutableList(reader!!.galleryInfo.files.size) { null }
-
-            folder.list { _, name ->
-                name?.substringAfterLast('.') in images
-            }?.sorted()?.take(list.size)?.forEachIndexed { i, name ->
-                list[i] = name
-            }
-
-            folder.getChild(".metadata").also { if (it.exists()) it.delete(); it.createNewFile() }.writeText(
-                Json.encodeToString(Metadata(galleryBlock, reader, list))
-            )
-
-            Cache.delete(this@migrate, galleryID)
-            downloadFolderMap[galleryID] = folder.name
-
-            downloadFolder.getChild(".download").let { if (!it.exists()) it.createNewFile(); it.writeText(Json.encodeToString(downloadFolderMap)) }
-        }
-
-        notification
-            .setContentText(getText(R.string.import_old_galleries_notification_done))
-            .setProgress(0, 0, false)
-            .setOngoing(false)
-            .mActions.clear()
-        notificationManager.notify(R.id.notification_id_import, notification.build())
-
-        kotlin.runCatching {
-            unregisterReceiver(receiver)
-        }
-    }
 }
\ No newline at end of file
diff --git a/app/src/main/res/drawable/ic_hiyobi.png b/app/src/main/res/drawable/ic_hiyobi.png
deleted file mode 100644
index 2af60c05..00000000
Binary files a/app/src/main/res/drawable/ic_hiyobi.png and /dev/null differ
diff --git a/app/src/main/res/values-ja/strings.xml b/app/src/main/res/values-ja/strings.xml
index 117f470c..dba21464 100644
--- a/app/src/main/res/values-ja/strings.xml
+++ b/app/src/main/res/values-ja/strings.xml
@@ -151,9 +151,10 @@
     <string name="no_camera">この機器には前面カメラが装着されていません</string>
     <string name="error">エラー</string>
     <string name="settings_cache_limit">キャッシュサイズ制限</string>
-    <string name="settings_cache_unlimited">制限なし</string>
+    <string name="unlimited">制限なし</string>
     <string name="settings_tag_translation">タグ言語</string>
     <string name="settings_tag_translation_message">Githubにて翻訳に参加できます</string>
-    <string name="settings_concurrent_download">並列ダウンロード</string>
+    <string name="settings_max_concurrent_download">並列ダウンロード</string>
     <string name="unaccessible_download_folder">アンドロイド11以上では外部からのアプリ内部空間接近が不可能です。ダウンロードフォルダを変更しますか？</string>
+    <string name="settings_networking">ネットワーク</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-ko/strings.xml b/app/src/main/res/values-ko/strings.xml
index bad91ff6..9cc2e9ca 100644
--- a/app/src/main/res/values-ko/strings.xml
+++ b/app/src/main/res/values-ko/strings.xml
@@ -151,9 +151,10 @@
     <string name="no_camera">이 장치에는 전면 카메라가 없습니다</string>
     <string name="error">오류</string>
     <string name="settings_cache_limit">캐시 크기 제한</string>
-    <string name="settings_cache_unlimited">무제한</string>
+    <string name="unlimited">무제한</string>
     <string name="settings_tag_translation">태그 언어</string>
     <string name="settings_tag_translation_message">Github에서 번역에 참여하세요</string>
-    <string name="settings_concurrent_download">병렬 다운로드</string>
+    <string name="settings_max_concurrent_download">병렬 다운로드</string>
     <string name="unaccessible_download_folder">안드로이드 11 이상에서는 외부에서 현재 다운로드 폴더에 접근할 수 없습니다. 변경하시겠습니까?</string>
+    <string name="settings_networking">네트워크</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
index dfb2976b..f95e86de 100644
--- a/app/src/main/res/values/arrays.xml
+++ b/app/src/main/res/values/arrays.xml
@@ -48,11 +48,6 @@
         <item>japanese|日本語</item>
     </string-array>
 
-    <string-array name="mirrors">
-        <item>HITOMI|hitomi.la</item>
-        <item>HIYOBI|hiyobi.me</item>
-    </string-array>
-
     <string-array name="proxy_type">
         <item>Direct</item>
         <item>HTTP</item>
@@ -70,7 +65,7 @@
     </string-array>
 
     <string-array name="cache_size_text">
-        <item>@string/settings_cache_unlimited</item>
+        <item>@string/unlimited</item>
         <item>1G</item>
         <item>2G</item>
         <item>4G</item>
@@ -79,4 +74,24 @@
         <item>32G</item>
     </string-array>
 
+    <string-array name="concurrent_download">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+        <item>4</item>
+        <item>8</item>
+        <item>16</item>
+        <item>32</item>
+    </string-array>
+
+    <string-array name="concurrent_download_text">
+        <item>@string/unlimited</item>
+        <item>1</item>
+        <item>2</item>
+        <item>4</item>
+        <item>8</item>
+        <item>16</item>
+        <item>32</item>
+    </string-array>
+
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index e35614fe..ee76168c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -30,6 +30,8 @@
 
     <string name="ignore">Ignore</string>
 
+    <string name="unlimited">Unlimited</string>
+
     <string name="copied_to_clipboard">Copied to clipboard</string>
 
     <string name="channel_download">Download</string>
@@ -166,7 +168,6 @@
     <string name="settings_download_folder_custom">Custom Location</string>
     <string name="settings_download_folder_not_writable">This folder is not writable. Please select another folder.</string>
     <string name="settings_cache_limit">Cache Limit</string>
-    <string name="settings_cache_unlimited">Unlimited</string>
     <string name="settings_nomedia_title">Hide image from gallery</string>
     <string name="settings_low_quality">Low quality images</string>
     <string name="settings_low_quality_summary">Load low quality images to improve load speed and data usage</string>
@@ -176,14 +177,17 @@
     <string name="settings_app_lock">App lock</string>
     <string name="settings_app_lock_type">App lock type</string>
 
+    <!-- SETTINGS/NETWORKING -->
+    <string name="settings_networking">Networking</string>
+    <string name="settings_mirror_summary">Load images from mirrors</string>
+    <string name="settings_proxy_title">Proxy</string>
+    <string name="settings_max_concurrent_download">Concurrent Download</string>
+
     <!-- SETTINGS/MISCELLANEOUS -->
 
     <string name="settings_miscellaneous_title">Miscellaneous</string>
     <string name="settings_tag_translation">Tag Language</string>
-    <string name="settings_concurrent_download">Concurrent Download</string>
     <string name="settings_tag_translation_message">Participate in translation on Github</string>
-    <string name="settings_mirror_summary">Load images from mirrors</string>
-    <string name="settings_proxy_title">Proxy</string>
     <string name="settings_rtl">Turn pages Right-to-Left</string>
     <string name="settings_security_mode_title">Enable security mode</string>
     <string name="settings_security_mode_summary">Enable security mode to make the screen invisible on recent app window</string>
diff --git a/app/src/main/res/xml/root_preferences.xml b/app/src/main/res/xml/root_preferences.xml
index 816c44b4..dc2e2624 100644
--- a/app/src/main/res/xml/root_preferences.xml
+++ b/app/src/main/res/xml/root_preferences.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto">
+<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:android="http://schemas.android.com/apk/res/android">
 
     <Preference
         app:key="app_version"
@@ -72,6 +73,23 @@
 
     </PreferenceCategory>
 
+    <PreferenceCategory
+        app:title="@string/settings_networking">
+
+        <Preference
+            app:key="proxy"
+            app:title="@string/settings_proxy_title"/>
+
+        <ListPreference
+            app:key="max_concurrent_download"
+            android:title="@string/settings_max_concurrent_download"
+            app:entries="@array/concurrent_download_text"
+            app:entryValues="@array/concurrent_download"
+            android:defaultValue="0"
+            app:useSimpleSummaryProvider="true"/>
+
+    </PreferenceCategory>
+
     <PreferenceCategory
         app:title="@string/settings_miscellaneous_title">
 
@@ -80,15 +98,6 @@
             app:title="@string/settings_tag_translation"
             app:useSimpleSummaryProvider="true"/>
 
-        <Preference
-            app:key="mirrors"
-            app:title="@string/settings_mirror_title"
-            app:summary="@string/settings_mirror_summary"/>
-
-        <Preference
-            app:key="proxy"
-            app:title="@string/settings_proxy_title"/>
-
         <SwitchPreferenceCompat
             app:key="rtl"
             app:title="@string/settings_rtl"
diff --git a/build.gradle b/build.gradle
index e7191ef0..90ef53b7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,29 +3,29 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.1'
+        classpath 'com.android.tools.build:gradle:4.2.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
-        classpath "com.google.gms:google-services:4.3.4"
+        classpath "com.google.gms:google-services:4.3.8"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
-        classpath "com.google.firebase:firebase-crashlytics-gradle:2.4.1"
-        classpath "com.google.firebase:perf-plugin:1.3.4"
-        classpath "com.google.android.gms:oss-licenses-plugin:0.10.2"
+        classpath "com.google.firebase:firebase-crashlytics-gradle:2.7.0"
+        classpath "com.google.firebase:perf-plugin:1.4.0"
+        classpath "com.google.android.gms:oss-licenses-plugin:0.10.4"
     }
 }
 
 allprojects {
     repositories {
-        maven { url  "http://dl.bintray.com/piasy/maven" }
         google()
+        mavenCentral()
         jcenter()
         maven { url "https://jitpack.io" }
-        maven { url "https://guardian.github.com/maven/repo-releases" }
+        maven { url "https://guardian.github.io/maven/repo-releases/" }
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index 2c2f1284..158703d0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -20,4 +20,4 @@ kotlin.code.style=official
 android.enableJetifier=true
 android.useAndroidX=true
 
-kotlin_version=1.4.20
\ No newline at end of file
+kotlin_version=1.5.10
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 52c5f178..906f70c5 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip