diff --git a/app/build.gradle b/app/build.gradle
index 2b813a86d..414762f43 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -23,7 +23,7 @@ android {
             keyPassword '111222'
         }
     }
-    ndkVersion "25.2.9519653"
+    ndkVersion "27.1.12297006"
     compileSdkVersion 29
     buildToolsVersion "29.0.2"
     defaultConfig {
diff --git a/sdk/explorer-link-android/src/main/java/com/tencent/iot/explorer/link/core/link/configNetwork/TIoTCoreUtil.kt b/sdk/explorer-link-android/src/main/java/com/tencent/iot/explorer/link/core/link/configNetwork/TIoTCoreUtil.kt
index f0534de09..d02eec496 100644
--- a/sdk/explorer-link-android/src/main/java/com/tencent/iot/explorer/link/core/link/configNetwork/TIoTCoreUtil.kt
+++ b/sdk/explorer-link-android/src/main/java/com/tencent/iot/explorer/link/core/link/configNetwork/TIoTCoreUtil.kt
@@ -24,7 +24,7 @@ import java.util.*
 
 class TIoTCoreUtil {
     @Volatile
-    var groupAddress = "***REMOVED***"
+    var groupAddress = "239.0.0.255"
 
     var softAPService: SoftAPService? = null
     var softAPConfigNetListener: SoftAPConfigNetListener? = null
diff --git a/sdkdemo/build.gradle b/sdkdemo/build.gradle
index c159f365a..103deae08 100644
--- a/sdkdemo/build.gradle
+++ b/sdkdemo/build.gradle
@@ -22,7 +22,7 @@ android {
             keyPassword '111222'
         }
     }
-    ndkVersion "25.2.9519653"
+    ndkVersion "27.1.12297006"
     compileSdkVersion 29
     buildToolsVersion "29.0.2"
     defaultConfig {
diff --git a/sdkdemo/src/main/res/layout/activity_wired_config_net.xml b/sdkdemo/src/main/res/layout/activity_wired_config_net.xml
index a75475d63..dd8730438 100644
--- a/sdkdemo/src/main/res/layout/activity_wired_config_net.xml
+++ b/sdkdemo/src/main/res/layout/activity_wired_config_net.xml
@@ -9,7 +9,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:hint="组播 ip"
-        android:text="***REMOVED***"
+        android:text="239.0.0.255"
         app:layout_constraintTop_toTopOf="parent"
         />