diff --git a/scripts/auto-install.sh b/scripts/auto-install.sh
index 8f87088..26fa565 100755
--- a/scripts/auto-install.sh
+++ b/scripts/auto-install.sh
@@ -43,13 +43,6 @@ curl -sL \
   -o "$WORKDIR/libs/libshadowhook_nothing.so" \
   "https://github.com/$REPO/releases/latest/download/libshadowhook_nothing.so"
 
-# --- Download inject script ---
-echo "[INFO] Downloading inject script..."
-curl -sL \
-  -o "$WORKDIR/inject.sh" \
-  "https://raw.githubusercontent.com/$REPO/refs/heads/main/scripts/inject.sh"
-chmod +x "$WORKDIR/inject.sh"
-
 # --- Pull APK splits from device ---
 APK_DIR="$HOME/reMarkable/app"
 mkdir -p "$APK_DIR"
@@ -74,9 +67,128 @@ if [ ! -f "$APK_DIR/base.apk" ]; then
     exit 1
 fi
 
-# --- Run inject ---
-echo "[INFO] Running inject script..."
-"$WORKDIR/inject.sh" "$APK_DIR"
+# --- Inject RMHook into APKs ---
+APK_DIR_INJECT="$APK_DIR"
+BUILD_DIR="$WORKDIR/build"
+OUTPUT_DIR="$WORKDIR/output"
+LIBS_DIR="$WORKDIR/libs"
+KEYSTORE="$WORKDIR/config/rmhook.keystore"
+KEYSTORE_PASS="rmhook"
+KEY_ALIAS="rmhook"
+ZIPALIGN="$BUILD_TOOLS/zipalign"
+APKSIGNER="$BUILD_TOOLS/apksigner"
+
+# Portable in-place sed (GNU vs BSD/macOS)
+sed_inplace() {
+    if sed --version >/dev/null 2>&1; then
+        sed -i "$@"
+    else
+        sed -i '' "$@"
+    fi
+}
+
+echo ""
+echo "[INFO] Injecting RMHook into reMarkable APKs..."
+
+rm -rf "$OUTPUT_DIR"
+mkdir -p "$OUTPUT_DIR"
+rm -rf "$BUILD_DIR/base" "$BUILD_DIR/split_arm64" "$BUILD_DIR/split_xxhdpi"
+rm -f "$BUILD_DIR"/*.apk
+
+# --- Step 1: Decompile and patch base.apk (smali injection) ---
+echo "[1/4] Patching base.apk (smali injection)..."
+apktool d -r "$APK_DIR_INJECT/base.apk" -o "$BUILD_DIR/base" -f
+
+MAIN_SMALI="$BUILD_DIR/base/smali/com/remarkable/mobile/MainActivity.smali"
+if [ ! -f "$MAIN_SMALI" ]; then
+    echo "❌ MainActivity.smali not found"
+    exit 1
+fi
+
+sed_inplace '/.method static constructor <clinit>()V/{
+n
+/.locals/{
+a\
+\
+    const-string v0, "rmhook"\
+\
+    invoke-static {v0}, Ljava/lang/System;->loadLibrary(Ljava/lang/String;)V
+}
+}' "$MAIN_SMALI"
+
+if ! grep -q 'invoke-static {v0}, Ljava/lang/System;->loadLibrary' "$MAIN_SMALI"; then
+    echo "❌ Failed to inject loadLibrary(\"rmhook\") into MainActivity.smali"
+    exit 1
+fi
+
+echo "✅ Injected System.loadLibrary(\"rmhook\") into MainActivity.<clinit>"
+apktool b "$BUILD_DIR/base" -o "$BUILD_DIR/base_patched.apk"
+
+# --- Step 2: Inject libraries into arm64 split ---
+echo "[2/4] Injecting ShadowHook libraries into arm64 split..."
+SPLIT_ARM64="$APK_DIR_INJECT/split_config.arm64_v8a.apk"
+if [ ! -f "$SPLIT_ARM64" ]; then
+    echo "❌ $SPLIT_ARM64 not found"
+    exit 1
+fi
+
+mkdir -p "$BUILD_DIR/split_arm64"
+unzip -q "$SPLIT_ARM64" -d "$BUILD_DIR/split_arm64"
+cp "$BUILD_DIR/librmhook.so" "$BUILD_DIR/split_arm64/lib/arm64-v8a/"
+cp "$LIBS_DIR/libshadowhook_nothing.so" "$BUILD_DIR/split_arm64/lib/arm64-v8a/"
+rm -rf "$BUILD_DIR/split_arm64/META-INF"
+(cd "$BUILD_DIR/split_arm64" && zip -q -r -0 "$BUILD_DIR/split_arm64_raw.apk" .)
+
+# --- Step 3: Align APKs ---
+echo "[3/4] Aligning APKs..."
+"$ZIPALIGN" -p -f 4 "$BUILD_DIR/base_patched.apk" "$BUILD_DIR/base_aligned.apk"
+"$ZIPALIGN" -p -f 4 "$BUILD_DIR/split_arm64_raw.apk" "$BUILD_DIR/split_arm64_aligned.apk"
+
+SPLIT_XXHDPI="$APK_DIR_INJECT/split_config.xxhdpi.apk"
+if [ -f "$SPLIT_XXHDPI" ]; then
+    mkdir -p "$BUILD_DIR/split_xxhdpi"
+    unzip -q "$SPLIT_XXHDPI" -d "$BUILD_DIR/split_xxhdpi"
+    rm -rf "$BUILD_DIR/split_xxhdpi/META-INF"
+    (cd "$BUILD_DIR/split_xxhdpi" && zip -q -r -0 "$BUILD_DIR/split_xxhdpi_raw.apk" .)
+    "$ZIPALIGN" -p -f 4 "$BUILD_DIR/split_xxhdpi_raw.apk" "$BUILD_DIR/split_xxhdpi_aligned.apk"
+fi
+
+# --- Step 4: Sign all APKs ---
+echo "[4/4] Signing APKs..."
+
+if [ ! -f "$KEYSTORE" ]; then
+    mkdir -p "$(dirname "$KEYSTORE")"
+    echo "🔑 Generating signing keystore..."
+    keytool -genkeypair -v \
+        -keystore "$KEYSTORE" \
+        -alias "$KEY_ALIAS" \
+        -keyalg RSA -keysize 2048 \
+        -validity 10000 \
+        -storepass "$KEYSTORE_PASS" \
+        -keypass "$KEYSTORE_PASS" \
+        -dname "CN=RMHook, OU=Dev, O=RMHook, L=Unknown, ST=Unknown, C=US" \
+        2>/dev/null
+fi
+
+sign_apk() {
+    local input="$1"
+    local output="$2"
+    "$APKSIGNER" sign \
+        --ks "$KEYSTORE" \
+        --ks-pass "pass:$KEYSTORE_PASS" \
+        --ks-key-alias "$KEY_ALIAS" \
+        --key-pass "pass:$KEYSTORE_PASS" \
+        --out "$output" \
+        "$input"
+}
+
+sign_apk "$BUILD_DIR/base_aligned.apk" "$OUTPUT_DIR/base.apk"
+sign_apk "$BUILD_DIR/split_arm64_aligned.apk" "$OUTPUT_DIR/split_config.arm64_v8a.apk"
+if [ -f "$BUILD_DIR/split_xxhdpi_aligned.apk" ]; then
+    sign_apk "$BUILD_DIR/split_xxhdpi_aligned.apk" "$OUTPUT_DIR/split_config.xxhdpi.apk"
+fi
+
+echo "✅ Injection successful!"
 
 # --- Install ---
 echo "[INFO] Installing patched APKs..."