diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/LauncherActivity.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/LauncherActivity.java
index b2cc87163..499ac6d74 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/LauncherActivity.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/LauncherActivity.java
@@ -27,6 +27,7 @@ import net.kdt.pojavlaunch.extra.ExtraListener;
 import net.kdt.pojavlaunch.fragments.MainMenuFragment;
 import net.kdt.pojavlaunch.fragments.MicrosoftLoginFragment;
 import net.kdt.pojavlaunch.fragments.SelectAuthFragment;
+import net.kdt.pojavlaunch.mirrors.DownloadMirror;
 import net.kdt.pojavlaunch.modloaders.modpacks.ModloaderInstallTracker;
 import net.kdt.pojavlaunch.modloaders.modpacks.imagecache.IconCacheJanitor;
 import net.kdt.pojavlaunch.prefs.LauncherPreferences;
@@ -141,6 +142,7 @@ public class LauncherActivity extends BaseActivity {
 
             @Override
             public void onDownloadFailed(Throwable th) {
+                if(DownloadMirror.checkForTamperedException(LauncherActivity.this, th)) return;
                 if(th != null) Tools.showError(LauncherActivity.this, R.string.mc_download_failed, th);
             }
         });
diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/fragments/ModVersionListFragment.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/fragments/ModVersionListFragment.java
index 581e487f0..b8150987e 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/fragments/ModVersionListFragment.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/fragments/ModVersionListFragment.java
@@ -16,6 +16,7 @@ import androidx.fragment.app.Fragment;
 
 import net.kdt.pojavlaunch.R;
 import net.kdt.pojavlaunch.Tools;
+import net.kdt.pojavlaunch.mirrors.DownloadMirror;
 import net.kdt.pojavlaunch.modloaders.ModloaderDownloadListener;
 import net.kdt.pojavlaunch.modloaders.ModloaderListenerProxy;
 import net.kdt.pojavlaunch.progresskeeper.ProgressKeeper;
@@ -143,6 +144,7 @@ public abstract class ModVersionListFragment<T> extends Fragment implements Runn
             getTaskProxy().detachListener();
             setTaskProxy(null);
             mExpandableListView.setEnabled(true);
+            if(DownloadMirror.checkForTamperedException(context, e)) return;
             Tools.showError(context, e);
         });
     }
diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/mirrors/DownloadMirror.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/mirrors/DownloadMirror.java
new file mode 100644
index 000000000..369cd1108
--- /dev/null
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/mirrors/DownloadMirror.java
@@ -0,0 +1,126 @@
+package net.kdt.pojavlaunch.mirrors;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.text.Html;
+import android.util.Log;
+
+import androidx.annotation.Nullable;
+
+import net.kdt.pojavlaunch.R;
+import net.kdt.pojavlaunch.Tools;
+import net.kdt.pojavlaunch.prefs.LauncherPreferences;
+import net.kdt.pojavlaunch.utils.DownloadUtils;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.net.MalformedURLException;
+
+public class DownloadMirror {
+    public static final int DOWNLOAD_CLASS_LIBRARIES = 0;
+    public static final int DOWNLOAD_CLASS_METADATA = 1;
+    public static final int DOWNLOAD_CLASS_ASSETS = 2;
+
+    private static final String[] MIRROR_BMCLAPI = {
+            "https://bmclapi2.bangbang93.com/maven",
+            "https://bmclapi2.bangbang93.com",
+            "https://bmclapi2.bangbang93.com/assets"
+    };
+
+    private static final String[] MIRROR_MCBBS = {
+            "https://download.mcbbs.net/maven",
+            "https://download.mcbbs.net",
+            "https://download.mcbbs.net/assets"
+    };
+
+    /**
+     * Download a file with the current mirror. If the file is missing on the mirror,
+     * fall back to the official source.
+     * @param downloadClass Class of the download. Can either be DOWNLOAD_CLASS_LIBRARIES,
+     *                      DOWNLOAD_CLASS_METADATA or DOWNLOAD_CLASS_ASSETS
+     * @param urlInput The original (Mojang) URL for the download
+     * @param outputFile The output file for the download
+     * @param buffer The shared buffer
+     * @param monitor The download monitor.
+     */
+    public static void downloadFileMirrored(int downloadClass, String urlInput, File outputFile,
+                                            @Nullable byte[] buffer, Tools.DownloaderFeedback monitor) throws IOException {
+        try {
+            DownloadUtils.downloadFileMonitored(getMirrorMapping(downloadClass, urlInput),
+                    outputFile, buffer, monitor);
+            return;
+        }catch (FileNotFoundException e) {
+            Log.w("DownloadMirror", "Cannot find the file on the mirror", e);
+            Log.i("DownloadMirror", "Failling back to default source");
+        }
+        DownloadUtils.downloadFileMonitored(urlInput, outputFile, buffer, monitor);
+    }
+
+    public static boolean isMirrored() {
+        return !LauncherPreferences.PREF_DOWNLOAD_SOURCE.equals("default");
+    }
+
+    public static boolean checkForTamperedException(Context context, Throwable e) {
+        if(e instanceof MirrorTamperedException){
+            showMirrorTamperedDialog(context);
+            return true;
+        }
+        return false;
+    }
+
+    private static void showMirrorTamperedDialog(Context ctx) {
+        Tools.runOnUiThread(()->{
+            AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
+            builder.setTitle(R.string.dl_tampered_manifest_title);
+            builder.setMessage(Html.fromHtml(ctx.getString(R.string.dl_tampered_manifest)));
+            builder.setPositiveButton(R.string.dl_switch_to_official_site,(d,w)->{
+                LauncherPreferences.DEFAULT_PREF.edit().putString("downloadSource", "default").apply();
+                LauncherPreferences.PREF_DOWNLOAD_SOURCE = "default";
+
+            });
+            builder.setNegativeButton(R.string.dl_turn_off_manifest_checks,(d,w)->{
+                LauncherPreferences.DEFAULT_PREF.edit().putBoolean("verifyManifest", false).apply();
+                LauncherPreferences.PREF_VERIFY_MANIFEST = false;
+            });
+            builder.setNeutralButton(android.R.string.cancel, (d,w)->{});
+            builder.show();
+        });
+    }
+
+    private static String[] getMirrorSettings() {
+        switch (LauncherPreferences.PREF_DOWNLOAD_SOURCE) {
+            case "mcbbs": return MIRROR_MCBBS;
+            case "bmclapi": return MIRROR_BMCLAPI;
+            case "default":
+            default:
+                return null;
+        }
+    }
+
+    private static String getMirrorMapping(int downloadClass, String mojangUrl) throws MalformedURLException{
+        String[] mirrorSettings = getMirrorSettings();
+        if(mirrorSettings == null) return mojangUrl;
+        int urlTail = getBaseUrlTail(mojangUrl);
+        String baseUrl = mojangUrl.substring(0, urlTail);
+        String path = mojangUrl.substring(urlTail);
+        switch(downloadClass) {
+            case DOWNLOAD_CLASS_ASSETS:
+            case DOWNLOAD_CLASS_METADATA:
+                baseUrl = mirrorSettings[downloadClass];
+                break;
+            case DOWNLOAD_CLASS_LIBRARIES:
+                if(!baseUrl.endsWith("libraries.minecraft.net")) break;
+                baseUrl = mirrorSettings[downloadClass];
+                break;
+        }
+        return baseUrl + path;
+    }
+
+    private static int getBaseUrlTail(String wholeUrl) throws MalformedURLException{
+        int protocolNameEnd = wholeUrl.indexOf("://");
+        if(protocolNameEnd == -1) throw new MalformedURLException("No protocol");
+        protocolNameEnd += 3;
+        return wholeUrl.indexOf('/', protocolNameEnd);
+    }
+}
diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/mirrors/MirrorTamperedException.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/mirrors/MirrorTamperedException.java
new file mode 100644
index 000000000..548d414e1
--- /dev/null
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/mirrors/MirrorTamperedException.java
@@ -0,0 +1,4 @@
+package net.kdt.pojavlaunch.mirrors;
+
+public class MirrorTamperedException extends Exception{
+}
diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/prefs/LauncherPreferences.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/prefs/LauncherPreferences.java
index ed7a42ad6..531073d9d 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/prefs/LauncherPreferences.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/prefs/LauncherPreferences.java
@@ -61,6 +61,9 @@ public class LauncherPreferences {
     public static float PREF_DEADZONE_SCALE = 1f;
     public static boolean PREF_BIG_CORE_AFFINITY = false;
     public static boolean PREF_ZINK_PREFER_SYSTEM_DRIVER = false;
+    
+    public static boolean PREF_VERIFY_MANIFEST = true;
+    public static String PREF_DOWNLOAD_SOURCE = "default";
 
 
 
@@ -104,6 +107,8 @@ public class LauncherPreferences {
         PREF_DEADZONE_SCALE = DEFAULT_PREF.getInt("gamepad_deadzone_scale", 100)/100f;
         PREF_BIG_CORE_AFFINITY = DEFAULT_PREF.getBoolean("bigCoreAffinity", false);
         PREF_ZINK_PREFER_SYSTEM_DRIVER = DEFAULT_PREF.getBoolean("zinkPreferSystemDriver", false);
+        PREF_DOWNLOAD_SOURCE = DEFAULT_PREF.getString("downloadSource", "default");
+        PREF_VERIFY_MANIFEST = DEFAULT_PREF.getBoolean("verifyManifest", true);
 
         String argLwjglLibname = "-Dorg.lwjgl.opengl.libname=";
         for (String arg : JREUtils.parseJavaArguments(PREF_CUSTOM_JAVA_ARGS)) {
diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/AsyncMinecraftDownloader.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/AsyncMinecraftDownloader.java
index 559a81bf5..def624f51 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/AsyncMinecraftDownloader.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/AsyncMinecraftDownloader.java
@@ -2,7 +2,7 @@ package net.kdt.pojavlaunch.tasks;
 
 import static net.kdt.pojavlaunch.PojavApplication.sExecutorService;
 import static net.kdt.pojavlaunch.Tools.BYTE_TO_MB;
-import static net.kdt.pojavlaunch.utils.DownloadUtils.downloadFileMonitored;
+import static net.kdt.pojavlaunch.mirrors.DownloadMirror.downloadFileMirrored;
 
 import android.app.Activity;
 import android.util.Log;
@@ -19,9 +19,10 @@ import net.kdt.pojavlaunch.R;
 import net.kdt.pojavlaunch.Tools;
 import net.kdt.pojavlaunch.extra.ExtraConstants;
 import net.kdt.pojavlaunch.extra.ExtraCore;
+import net.kdt.pojavlaunch.mirrors.DownloadMirror;
+import net.kdt.pojavlaunch.mirrors.MirrorTamperedException;
 import net.kdt.pojavlaunch.prefs.LauncherPreferences;
 import net.kdt.pojavlaunch.progresskeeper.ProgressKeeper;
-import net.kdt.pojavlaunch.utils.DownloadUtils;
 import net.kdt.pojavlaunch.value.DependentLibrary;
 import net.kdt.pojavlaunch.value.MinecraftClientInfo;
 import net.kdt.pojavlaunch.value.MinecraftLibraryArtifact;
@@ -127,7 +128,8 @@ public class AsyncMinecraftDownloader {
                 if (!outLib.exists()) {
                     ProgressLayout.setProgress(ProgressLayout.DOWNLOAD_MINECRAFT, 0, R.string.mcl_launch_downloading, verInfo.logging.client.file.id);
                     JMinecraftVersionList.Version finalVerInfo = verInfo;
-                    downloadFileMonitored(
+                    downloadFileMirrored(
+                            DownloadMirror.DOWNLOAD_CLASS_METADATA,
                             verInfo.logging.client.file.url, outLib, getByteBuffer(),
                             (curr, max) -> ProgressLayout.setProgress(ProgressLayout.DOWNLOAD_MINECRAFT,
                                     (int) Math.max((float)curr/max*100,0), R.string.mcl_launch_downloading_progress, finalVerInfo.logging.client.file.id, curr/BYTE_TO_MB, max/BYTE_TO_MB)
@@ -185,6 +187,7 @@ public class AsyncMinecraftDownloader {
                 }
             }
         } catch (DownloaderException e) {
+            ProgressKeeper.submitProgress(ProgressLayout.DOWNLOAD_MINECRAFT, -1, -1);
             throw e;
         } catch (Throwable e) {
             Log.e("AsyncMcDownloader", e.toString(),e );
@@ -214,7 +217,7 @@ public class AsyncMinecraftDownloader {
     }
 
     public void verifyAndDownloadMainJar(String url, String sha1, File destination) throws Exception{
-        while(!destination.exists() || (destination.exists() && !Tools.compareSHA1(destination, sha1))) downloadFileMonitored(
+        while(!destination.exists() || (destination.exists() && !Tools.compareSHA1(destination, sha1))) downloadFileMirrored(DownloadMirror.DOWNLOAD_CLASS_LIBRARIES,
                 url,
                 destination, getByteBuffer(),
                 (curr, max) -> ProgressLayout.setProgress(ProgressLayout.DOWNLOAD_MINECRAFT,
@@ -289,7 +292,7 @@ public class AsyncMinecraftDownloader {
     public void downloadAsset(JAssetInfo asset, File objectsDir, AtomicInteger downloadCounter) throws IOException {
         String assetPath = asset.hash.substring(0, 2) + "/" + asset.hash;
         File outFile = new File(objectsDir, assetPath);
-        downloadFileMonitored(MINECRAFT_RES + assetPath, outFile, getByteBuffer(),
+        downloadFileMirrored(DownloadMirror.DOWNLOAD_CLASS_ASSETS, MINECRAFT_RES + assetPath, outFile, getByteBuffer(),
                 new Tools.DownloaderFeedback() {
                     int prevCurr;
                     @Override
@@ -303,7 +306,7 @@ public class AsyncMinecraftDownloader {
     public void downloadAssetMapped(JAssetInfo asset, String assetName, File resDir, AtomicInteger downloadCounter) throws IOException {
         String assetPath = asset.hash.substring(0, 2) + "/" + asset.hash;
         File outFile = new File(resDir,"/"+assetName);
-        downloadFileMonitored(MINECRAFT_RES + assetPath, outFile, getByteBuffer(),
+        downloadFileMirrored(DownloadMirror.DOWNLOAD_CLASS_ASSETS, MINECRAFT_RES + assetPath, outFile, getByteBuffer(),
                 new Tools.DownloaderFeedback() {
                     int prevCurr;
                     @Override
@@ -336,7 +339,7 @@ public class AsyncMinecraftDownloader {
                 timesChecked++;
                 if(timesChecked > 5) throw new RuntimeException("Library download failed after 5 retries");
 
-                downloadFileMonitored(libPathURL, outLib, getByteBuffer(),
+                downloadFileMirrored(DownloadMirror.DOWNLOAD_CLASS_LIBRARIES, libPathURL, outLib, getByteBuffer(),
                         (curr, max) -> ProgressLayout.setProgress(ProgressLayout.DOWNLOAD_MINECRAFT,
                                 (int) Math.max((float)curr/max*100,0), R.string.mcl_launch_downloading_progress, outLib.getName(), curr/BYTE_TO_MB, max/BYTE_TO_MB)
                 );
@@ -362,30 +365,44 @@ public class AsyncMinecraftDownloader {
     public JAssets downloadIndex(JMinecraftVersionList.Version version, File output) throws IOException {
         if (!output.exists()) {
             output.getParentFile().mkdirs();
-            DownloadUtils.downloadFile(version.assetIndex != null
+            downloadFileMirrored(DownloadMirror.DOWNLOAD_CLASS_METADATA, version.assetIndex != null
                     ? version.assetIndex.url
-                    : "https://s3.amazonaws.com/Minecraft.Download/indexes/" + version.assets + ".json", output);
+                    : "https://s3.amazonaws.com/Minecraft.Download/indexes/" + version.assets + ".json", output, null,
+                    (curr, max) -> ProgressLayout.setProgress(ProgressLayout.DOWNLOAD_MINECRAFT,
+                            (int) Math.max((float)curr/max*100,0), R.string.mcl_launch_downloading_progress, output.getName(), curr/BYTE_TO_MB, max/BYTE_TO_MB)
+            );
         }
 
         return Tools.GLOBAL_GSON.fromJson(Tools.read(output.getAbsolutePath()), JAssets.class);
     }
 
-    public void downloadVersionJson(String versionName, File verJsonDir, JMinecraftVersionList.Version verInfo) throws IOException {
+    public void downloadVersionJson(String versionName, File verJsonDir, JMinecraftVersionList.Version verInfo) throws IOException, DownloaderException {
         if(!LauncherPreferences.PREF_CHECK_LIBRARY_SHA)  Log.w("Chk","Checker is off");
 
-        boolean isManifestGood = verJsonDir.exists()
-                && (!LauncherPreferences.PREF_CHECK_LIBRARY_SHA
-                || verInfo.sha1 == null
-                || Tools.compareSHA1(verJsonDir, verInfo.sha1));
-
-        if(!isManifestGood) {
+        boolean isManifestGood = verifyManifest(verJsonDir, verInfo);
+        byte retryCount = 0;
+        while(!isManifestGood && retryCount < 5) {
             ProgressLayout.setProgress(ProgressLayout.DOWNLOAD_MINECRAFT, 0, R.string.mcl_launch_downloading, versionName + ".json");
-            verJsonDir.delete();
-            downloadFileMonitored(verInfo.url, verJsonDir, getByteBuffer(),
+            downloadFileMirrored(DownloadMirror.DOWNLOAD_CLASS_METADATA, verInfo.url, verJsonDir, getByteBuffer(),
                     (curr, max) -> ProgressLayout.setProgress(ProgressLayout.DOWNLOAD_MINECRAFT,
                             (int) Math.max((float)curr/max*100,0), R.string.mcl_launch_downloading_progress, versionName + ".json", curr/BYTE_TO_MB, max/BYTE_TO_MB)
             );
+            isManifestGood = verifyManifest(verJsonDir, verInfo);
+            retryCount++;
+            // Always do the first verification. But skip all the errors from further ones.
+            if(!LauncherPreferences.PREF_VERIFY_MANIFEST) return;
         }
+        if(!isManifestGood) {
+            if(DownloadMirror.isMirrored()) throw new DownloaderException(new MirrorTamperedException());
+            else throw new DownloaderException(new IOException("Manifest check failed after 5 tries"));
+        }
+    }
+
+    private boolean verifyManifest(File verJsonDir, JMinecraftVersionList.Version verInfo) {
+        return verJsonDir.exists()
+                && (!LauncherPreferences.PREF_CHECK_LIBRARY_SHA
+                || verInfo.sha1 == null
+                || Tools.compareSHA1(verJsonDir, verInfo.sha1));
     }
 
     public static String normalizeVersionId(String versionString) {
@@ -432,5 +449,4 @@ public class AsyncMinecraftDownloader {
             super(e);
         }
     }
-
 }
diff --git a/app_pojavlauncher/src/main/res/values/headings_array.xml b/app_pojavlauncher/src/main/res/values/headings_array.xml
index f1ae79ee9..4aeec2565 100644
--- a/app_pojavlauncher/src/main/res/values/headings_array.xml
+++ b/app_pojavlauncher/src/main/res/values/headings_array.xml
@@ -40,5 +40,15 @@
         <item>vulkan_zink</item> <!-- virglrenderer with OpenGL ES 3 -->
         <item>opengles3_desktopgl_angle_vulkan</item>
     </string-array>
+    <string-array name="download_source_names">
+        <item>@string/global_default</item>
+        <item>BMCLAPI</item>
+        <item>MCBBS</item>
+    </string-array>
+    <string-array name="download_source_values">
+        <item>default</item>
+        <item>bmclapi</item>
+        <item>mcbbs</item>
+    </string-array>
 
 </resources>
diff --git a/app_pojavlauncher/src/main/res/values/strings.xml b/app_pojavlauncher/src/main/res/values/strings.xml
index 422cc238c..8e8c0bf31 100644
--- a/app_pojavlauncher/src/main/res/values/strings.xml
+++ b/app_pojavlauncher/src/main/res/values/strings.xml
@@ -338,4 +338,16 @@
     <string name="notif_error_occured">An error has occurred</string>
     <string name="notif_error_occured_desc">Click to see more details</string>
     <string name="fabric_dl_only_stable">Show only stable versions</string>
+    <string name="dl_tampered_manifest_title">File verification warning</string>
+    <string name="dl_tampered_manifest"><![CDATA[The game version manifest on the mirror does not match the official Mojang version manifest, which means it may have been tampered with.<br/>
+        <b>This is not safe. Your personal information may be at risk if you continue.</b><br/>
+        If you still want to use the mirror, press \"Turn off manifest checks\" and start the download again.<br/>
+        If you want to use the official download source, press \"Switch to official site\" and start the download again.<br/>]]>
+    </string>
+    <string name="dl_turn_off_manifest_checks">Turn off manifest checks</string>
+    <string name="dl_switch_to_official_site">Switch to official site</string>
+    <string name="preference_download_source_title">Game download source</string>
+    <string name="preference_download_source_description">Select a download mirror instead of using the official download server</string>
+    <string name="preference_verify_manifest_title">Verify game version manifest</string>
+    <string name="preference_verify_manifest_description">When enabled, the launcher will check the game version manifest along with the libraries.</string>
 </resources>
diff --git a/app_pojavlauncher/src/main/res/xml/pref_misc.xml b/app_pojavlauncher/src/main/res/xml/pref_misc.xml
index b93694ab6..fbb1f7b4f 100644
--- a/app_pojavlauncher/src/main/res/xml/pref_misc.xml
+++ b/app_pojavlauncher/src/main/res/xml/pref_misc.xml
@@ -16,6 +16,20 @@
             android:key="arc_capes"
             android:summary="@string/arc_capes_desc"
             android:title="@string/arc_capes_title" />
+        <androidx.preference.ListPreference
+            android:defaultValue="default"
+            android:key="downloadSource"
+            android:entries="@array/download_source_names"
+            android:entryValues="@array/download_source_values"
+            android:title="@string/preference_download_source_title"
+            android:summary="@string/preference_download_source_description"
+            app2:useSimpleSummaryProvider="true"/>
+        <SwitchPreference
+            android:defaultValue="true"
+            android:key="verifyManifest"
+            android:title="@string/preference_verify_manifest_title"
+            android:summary="@string/preference_verify_manifest_description"/>
+
         <SwitchPreference
             android:defaultValue="false"
             android:key="zinkPreferSystemDriver"