diff --git a/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.bin b/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.bin
index 83bf4f1..9336693 100644
Binary files a/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.bin and b/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.bin differ
diff --git a/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.lock b/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.lock
index d137783..fd1f4ec 100644
Binary files a/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.lock and b/packages/client-android/android/.gradle/8.10.2/fileHashes/fileHashes.lock differ
diff --git a/packages/client-android/android/.gradle/8.10.2/fileHashes/resourceHashesCache.bin b/packages/client-android/android/.gradle/8.10.2/fileHashes/resourceHashesCache.bin
index 577e9c0..079ba66 100644
Binary files a/packages/client-android/android/.gradle/8.10.2/fileHashes/resourceHashesCache.bin and b/packages/client-android/android/.gradle/8.10.2/fileHashes/resourceHashesCache.bin differ
diff --git a/packages/client-android/android/.gradle/buildOutputCleanup/buildOutputCleanup.lock b/packages/client-android/android/.gradle/buildOutputCleanup/buildOutputCleanup.lock
index df7b6a1..2bf0c79 100644
Binary files a/packages/client-android/android/.gradle/buildOutputCleanup/buildOutputCleanup.lock and b/packages/client-android/android/.gradle/buildOutputCleanup/buildOutputCleanup.lock differ
diff --git a/packages/client-android/android/.gradle/file-system.probe b/packages/client-android/android/.gradle/file-system.probe
index a803afb..b43c857 100644
Binary files a/packages/client-android/android/.gradle/file-system.probe and b/packages/client-android/android/.gradle/file-system.probe differ
diff --git a/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainApplication.kt b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainApplication.kt
index e1fa547..9155a5d 100644
--- a/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainApplication.kt
+++ b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainApplication.kt
@@ -1,5 +1,24 @@
 package dev.yuzu.gca
 
 import android.app.Application
+import com.facebook.react.PackageList
+import com.facebook.react.ReactApplication
+import com.facebook.react.ReactNativeHost
+import com.facebook.react.ReactPackage
+import com.facebook.react.defaults.DefaultReactNativeHost
+import com.facebook.soloader.SoLoader
 
-class MainApplication : Application()
+class MainApplication : Application(), ReactApplication {
+    override val reactNativeHost: ReactNativeHost =
+        object : DefaultReactNativeHost(this) {
+            override fun getPackages(): List<ReactPackage> =
+                PackageList(this).packages.apply { add(PackageInstallerPackage()) }
+            override fun getJSMainModuleName() = "index"
+            override fun getUseDeveloperSupport() = false
+        }
+
+    override fun onCreate() {
+        super.onCreate()
+        SoLoader.init(this, false)
+    }
+}
diff --git a/packages/client-android/android/app/src/main/java/dev/yuzu/gca/PackageInstallerModule.kt b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/PackageInstallerModule.kt
new file mode 100644
index 0000000..3237fd7
--- /dev/null
+++ b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/PackageInstallerModule.kt
@@ -0,0 +1,51 @@
+package dev.yuzu.gca
+
+import android.app.PendingIntent
+import android.content.Intent
+import android.content.pm.PackageInstaller
+import com.facebook.react.bridge.*
+import java.io.File
+import java.security.MessageDigest
+
+class PackageInstallerModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {
+    override fun getName() = "PackageInstallerModule"
+
+    @ReactMethod
+    fun installApk(filePath: String, expectedSha256: String, promise: Promise) {
+        try {
+            val context = reactApplicationContext
+            val apkFile = File(filePath)
+            if (!apkFile.exists()) { promise.reject("NOT_FOUND", "APK not found"); return }
+
+            if (!context.packageManager.canRequestPackageInstalls()) {
+                promise.reject("PERMISSION", "Install permission not granted"); return
+            }
+
+            // SHA256 verify
+            val sha256 = MessageDigest.getInstance("SHA-256")
+            apkFile.inputStream().use { input ->
+                val buf = ByteArray(8192); var read: Int
+                while (input.read(buf).also { read = it } != -1) sha256.update(buf, 0, read)
+            }
+            if (sha256.digest().joinToString("") { "%02x".format(it) } != expectedSha256) {
+                promise.reject("SHA256", "SHA256 mismatch"); return
+            }
+
+            val pi = context.packageManager.packageInstaller
+            val sessionId = pi.createSession(PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL))
+            val session = pi.openSession(sessionId)
+            try {
+                apkFile.inputStream().use { input ->
+                    session.openWrite("package", 0, apkFile.length()).use { output ->
+                        input.copyTo(output); session.fsync(output)
+                    }
+                }
+                val launchIntent = context.packageManager.getLaunchIntentForPackage(context.packageName)
+                    ?: run { promise.reject("NO_INTENT", "No launch intent"); return }
+                session.commit(PendingIntent.getActivity(context, 0, launchIntent,
+                    PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE).intentSender)
+                promise.resolve("installed")
+            } finally { session.close() }
+        } catch (e: Exception) { promise.reject("ERROR", e.message) }
+    }
+}
diff --git a/packages/client-android/android/app/src/main/java/dev/yuzu/gca/PackageInstallerPackage.kt b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/PackageInstallerPackage.kt
new file mode 100644
index 0000000..eb4c2f1
--- /dev/null
+++ b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/PackageInstallerPackage.kt
@@ -0,0 +1,12 @@
+package dev.yuzu.gca
+
+import com.facebook.react.ReactPackage
+import com.facebook.react.bridge.NativeModule
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.uimanager.ViewManager
+
+class PackageInstallerPackage : ReactPackage {
+    override fun createNativeModules(reactContext: ReactApplicationContext): List<NativeModule> =
+        listOf(PackageInstallerModule(reactContext))
+    override fun createViewManagers(reactContext: ReactApplicationContext): List<ViewManager<*, *>> = emptyList()
+}