diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..efb9bc7
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,26 @@
+# Changelog
+
+## v0.2.1
++ Fix the memory leak in RFCOMM communication
++ Add fallback code for "Connect Audio"
++ Request required permissions on Android
+
+## v0.2
++ Add confirmation dialog
++ Add support for receiving/sending long packets
++ Add support for saving/restoring settings
++ Add support for switching audio connection
++ Add debugging panel
++ Add support for remembering the last connected device
+
+## v0.1
++ Add support for W200BT Plus
++ Add support for BLE
++ Faster device discovery on Windows(RFCOMM)
+
+## v0.0.3
++ Fix issue [#1](https://github.com/wh201906/mEDIFIER/issues/1)
++ Add length limit for name
+
+## v0.0.1
+The first release version
diff --git a/Qt/android/AndroidManifest.xml b/Qt/android/AndroidManifest.xml
index 8d40c44..6769f41 100644
--- a/Qt/android/AndroidManifest.xml
+++ b/Qt/android/AndroidManifest.xml
@@ -1,5 +1,10 @@
 <?xml version="1.0"?>
-<manifest package="io.github.wh201906.medifier.qt" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="v0.2" android:versionCode="20" android:installLocation="auto">
+<manifest
+    package="io.github.wh201906.medifier.qt"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:versionName="v0.2.1"
+    android:versionCode="21"
+    android:installLocation="auto">
     <!-- The following comment will be replaced upon deployment with default permissions based on the dependencies of the application.
          Remove the comment if you do not require these default permissions. -->
 
@@ -8,9 +13,22 @@
          Remove the comment if you do not require these default features. -->
     <!-- %%INSERT_FEATURES -->
 
-    <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
-    <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="mEDIFIER" android:extractNativeLibs="true">
-        <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density" android:name="io.github.wh201906.medifier.qt.MainActivity" android:label="-- %%INSERT_APP_NAME%% --" android:screenOrientation="unspecified" android:launchMode="singleTop">
+    <supports-screens
+    android:largeScreens="true"
+    android:normalScreens="true"
+    android:anyDensity="true"
+    android:smallScreens="true"/>
+    <application
+        android:hardwareAccelerated="true"
+        android:name="org.qtproject.qt5.android.bindings.QtApplication"
+        android:label="mEDIFIER"
+        android:extractNativeLibs="true">
+        <activity
+            android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density"
+            android:name="io.github.wh201906.medifier.qt.MainActivity"
+            android:label="-- %%INSERT_APP_NAME%% --"
+            android:screenOrientation="unspecified"
+            android:launchMode="singleTop">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
diff --git a/Qt/mEDIFIER.pro b/Qt/mEDIFIER.pro
index 4c51adb..6301277 100644
--- a/Qt/mEDIFIER.pro
+++ b/Qt/mEDIFIER.pro
@@ -54,7 +54,7 @@ DISTFILES += \
     android/AndroidManifest.xml
 
 # Remember to change version in AndroidManifest.xml
-VERSION = 0.2.0
+VERSION = 0.2.1
 # Expose VERSION to the source files.
 DEFINES += APP_VERSION=\\\"$$VERSION\\\"
 QMAKE_TARGET_PRODUCT = "mEDIFIER"
diff --git a/Qt/mEDIFIER_zh_CN.ts b/Qt/mEDIFIER_zh_CN.ts
index 1335261..881e15a 100644
--- a/Qt/mEDIFIER_zh_CN.ts
+++ b/Qt/mEDIFIER_zh_CN.ts
@@ -10,12 +10,13 @@
     </message>
     <message>
         <location filename="devices/basedevice.ui" line="26"/>
-        <location filename="devices/basedevice.cpp" line="188"/>
-        <location filename="devices/basedevice.cpp" line="194"/>
-        <location filename="devices/basedevice.cpp" line="200"/>
-        <location filename="devices/basedevice.cpp" line="206"/>
-        <location filename="devices/basedevice.cpp" line="537"/>
-        <location filename="devices/basedevice.cpp" line="595"/>
+        <location filename="devices/basedevice.cpp" line="184"/>
+        <location filename="devices/basedevice.cpp" line="190"/>
+        <location filename="devices/basedevice.cpp" line="196"/>
+        <location filename="devices/basedevice.cpp" line="202"/>
+        <location filename="devices/basedevice.cpp" line="534"/>
+        <location filename="devices/basedevice.cpp" line="592"/>
+        <location filename="devices/basedevice.cpp" line="610"/>
         <source>Info</source>
         <translation>信息</translation>
     </message>
@@ -271,81 +272,88 @@
         <translation>恢复到设备</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="188"/>
+        <location filename="devices/basedevice.cpp" line="184"/>
         <source>The device will be powered off
 Continue?</source>
         <translation>设备将会关机
 继续吗？</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="194"/>
+        <location filename="devices/basedevice.cpp" line="190"/>
         <source>The device will be disconnected
 Continue?</source>
         <translation>设备将会断开连接
 继续吗？</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="200"/>
+        <location filename="devices/basedevice.cpp" line="196"/>
         <source>The device will get into pairing state
 Continue?</source>
         <translation>设备将会进入配对模式
 继续吗？</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="206"/>
+        <location filename="devices/basedevice.cpp" line="202"/>
         <source>The device will be reseted
 Continue?</source>
         <translation>设备将会恢复出厂设置
 继续吗？</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="220"/>
+        <location filename="devices/basedevice.cpp" line="216"/>
         <source>The name is too long</source>
         <translation>设备名过长</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="489"/>
+        <location filename="devices/basedevice.cpp" line="486"/>
         <source>Save Settings</source>
         <translation>保存设置</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="533"/>
-        <location filename="devices/basedevice.cpp" line="555"/>
-        <location filename="devices/basedevice.cpp" line="562"/>
-        <location filename="devices/basedevice.cpp" line="568"/>
+        <location filename="devices/basedevice.cpp" line="530"/>
+        <location filename="devices/basedevice.cpp" line="552"/>
+        <location filename="devices/basedevice.cpp" line="559"/>
+        <location filename="devices/basedevice.cpp" line="565"/>
         <source>Error</source>
         <translation>错误</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="533"/>
+        <location filename="devices/basedevice.cpp" line="530"/>
         <source>Failed to save to</source>
         <translation>无法保存至</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="537"/>
+        <location filename="devices/basedevice.cpp" line="534"/>
         <source>Saved</source>
         <translation>已保存</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="555"/>
+        <location filename="devices/basedevice.cpp" line="552"/>
         <source>Failed to open</source>
         <translation>无法打开</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="562"/>
+        <location filename="devices/basedevice.cpp" line="559"/>
         <source>Invalid JSON file</source>
         <translation>无效的JSON文件</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="568"/>
+        <location filename="devices/basedevice.cpp" line="565"/>
         <source>Invalid format</source>
         <translation>文件格式错误</translation>
     </message>
     <message>
-        <location filename="devices/basedevice.cpp" line="595"/>
+        <location filename="devices/basedevice.cpp" line="592"/>
         <source>Done</source>
         <translation>完成</translation>
     </message>
+    <message>
+        <location filename="devices/basedevice.cpp" line="610"/>
+        <source>You haven&apos;t connect to any device yet
+Use last audio device?</source>
+        <translation>尚未连接到任何设备
+使用上次连接的音频设备吗？</translation>
+    </message>
 </context>
 <context>
     <name>CommBLE</name>
@@ -363,12 +371,12 @@ Continue?</source>
 <context>
     <name>CommRFCOMM</name>
     <message>
-        <location filename="comms/commrfcomm.cpp" line="36"/>
+        <location filename="comms/commrfcomm.cpp" line="37"/>
         <source>Device Connected</source>
         <translation>设备已连接</translation>
     </message>
     <message>
-        <location filename="comms/commrfcomm.cpp" line="41"/>
+        <location filename="comms/commrfcomm.cpp" line="43"/>
         <source>Device Disconnected</source>
         <translation>设备已断开</translation>
     </message>
@@ -444,24 +452,24 @@ Continue?</source>
         <translation>断开连接</translation>
     </message>
     <message>
-        <location filename="deviceform.cpp" line="109"/>
-        <location filename="deviceform.cpp" line="251"/>
+        <location filename="deviceform.cpp" line="112"/>
+        <location filename="deviceform.cpp" line="258"/>
         <source>RFCOMM</source>
         <translation></translation>
     </message>
     <message>
-        <location filename="deviceform.cpp" line="107"/>
-        <location filename="deviceform.cpp" line="249"/>
+        <location filename="deviceform.cpp" line="110"/>
+        <location filename="deviceform.cpp" line="256"/>
         <source>BLE</source>
         <translation></translation>
     </message>
     <message>
-        <location filename="deviceform.cpp" line="55"/>
+        <location filename="deviceform.cpp" line="58"/>
         <source>Bluetooth is not available</source>
         <translation>蓝牙不可用</translation>
     </message>
     <message>
-        <location filename="deviceform.cpp" line="169"/>
+        <location filename="deviceform.cpp" line="172"/>
         <source>Not a valid Bluetooth address</source>
         <translation>蓝牙地址无效</translation>
     </message>
@@ -479,42 +487,42 @@ Continue?</source>
         <translation>读取设置</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="57"/>
+        <location filename="mainwindow.cpp" line="55"/>
         <source>Device</source>
         <translation>设备</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="148"/>
+        <location filename="mainwindow.cpp" line="147"/>
         <source>Device not connected</source>
         <translation>设备未连接</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="227"/>
+        <location filename="mainwindow.cpp" line="264"/>
         <source>Device detected</source>
         <translation>识别到设备</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="242"/>
+        <location filename="mainwindow.cpp" line="279"/>
         <source>Dev Mode ON</source>
         <translation>调试模式已启用</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="249"/>
+        <location filename="mainwindow.cpp" line="286"/>
         <source>Dev Mode OFF</source>
         <translation>调试模式已关闭</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="270"/>
+        <location filename="mainwindow.cpp" line="307"/>
         <source>Generic Device</source>
         <translation>通用设备</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="271"/>
+        <location filename="mainwindow.cpp" line="308"/>
         <source>W820NB Double Gold</source>
         <translation>W820NB双金标版</translation>
     </message>
     <message>
-        <location filename="mainwindow.cpp" line="272"/>
+        <location filename="mainwindow.cpp" line="309"/>
         <source>W200BT Plus</source>
         <translation></translation>
     </message>