diff --git a/README.md b/README.md
index cbf0fb9..d37f46d 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,10 @@ Description
 Users can manage the device remotely via the management page without needing to operate the screen, enabling access to an app store and management of third-party applications.
 Adapt to simple configuration, startup and other functions.
 
+<center class="half">
+<img src="./README/AppMain.png" alt="Main page" style="zoom:25%"/>
+</center>
+
 [OpenVPN]()
 
 <center class="half">
@@ -48,4 +52,9 @@ Download [app-release.apk](https://github.com/jtun-coder/JtunRouting/releases) a
 
 # Support
 
-Email: <jtun@86.ltd>
\ No newline at end of file
+Email: <jtun@86.ltd>
+
+# Join a group
+<center class="half">
+<img src="./README/qrcode.jpg" alt="qrcode" style="zoom:25%"/>
+</center>
\ No newline at end of file
diff --git a/README/AppMain.png b/README/AppMain.png
new file mode 100644
index 0000000..3479cb0
Binary files /dev/null and b/README/AppMain.png differ
diff --git a/README/qrcode.jpg b/README/qrcode.jpg
new file mode 100644
index 0000000..60a1ab7
Binary files /dev/null and b/README/qrcode.jpg differ
diff --git a/app/src/main/java/com/jtun/router/App.kt b/app/src/main/java/com/jtun/router/App.kt
index ce8d9e3..8406778 100644
--- a/app/src/main/java/com/jtun/router/App.kt
+++ b/app/src/main/java/com/jtun/router/App.kt
@@ -57,7 +57,7 @@ class App : Application() {
         deviceStorage.moveDatabaseFrom(this, AppDatabase.DB_NAME)
         Services.init { this }
         WifiApControl.getInstance().init(this)
-        KLog.init(true)
+        KLog.init(BuildConfig.DEBUG)
         BootReceiver.migrateIfNecessary()
         System.setProperty(DEBUG_PROPERTY_NAME, DEBUG_PROPERTY_VALUE_ON)
         ServiceNotification.updateNotificationChannels()
diff --git a/app/src/main/java/com/jtun/router/MainActivity.kt b/app/src/main/java/com/jtun/router/MainActivity.kt
index bed7ec4..22e7d4f 100644
--- a/app/src/main/java/com/jtun/router/MainActivity.kt
+++ b/app/src/main/java/com/jtun/router/MainActivity.kt
@@ -43,6 +43,7 @@ import org.json.JSONObject
 import pub.devrel.easypermissions.AfterPermissionGranted
 import pub.devrel.easypermissions.AppSettingsDialog
 import pub.devrel.easypermissions.EasyPermissions
+import kotlin.system.exitProcess
 
 
 class MainActivity : AppCompatActivity(), EasyPermissions.PermissionCallbacks, LocalServerListener {
@@ -171,7 +172,9 @@ class MainActivity : AppCompatActivity(), EasyPermissions.PermissionCallbacks, L
         handler.removeCallbacks(getSpeedRunnable)
         FrpUtil.stopFrp()
         TetheringUtil.stopTetheringService()
+        LocalServer.instance.release()
         super.onDestroy()
+        exitProcess(0)
     }
 
     /**