diff --git a/README.en.md b/README.en.md
index 6bcbd069bf15c6408bb2cd5981acad9c6617dd81..3987746918741ebec7de8526502a017106af80ef 100644
--- a/README.en.md
+++ b/README.en.md
@@ -44,10 +44,10 @@ N/A.
 
 ## Constraints
 
-1. This sample is only supported on Huawei phones running standard systems.
-2. The HarmonyOS version must be HarmonyOS 6.0.0 Release or later.
+1. The sample is only supported on Huawei phones with standard systems.
+2. The HarmonyOS version must be HarmonyOS 5.1.1 Release or later.
 3. The DevEco Studio version must be DevEco Studio 6.0.0 Release or later.
 4. The HarmonyOS SDK version must be HarmonyOS 6.0.0 Release SDK or later.
-5. Both devices must be logged in with the same HUAWEI ID.
-6. Wi-Fi and Bluetooth must be enabled on both devices. If possible, both devices should be connected to the same LAN to improve the data transmission speed.
-7. Application continuation can be triggered only between the same application (UIAbility) of both devices, that is, the application must have been installed on the two devices.
+5. Double-ended devices need to log in to the same Huawei account, so it is recommended to turn on the device finding function.
+6. Double-ended devices need to turn on the Wi-Fi and Bluetooth switches. When conditions permit, it is recommended to connect to the same LAN.
+7. Both end devices need this application.
diff --git a/README.md b/README.md
index fdb18a5067b9ca6fe3a0e97e46bba1040092fb1e..688bed19f7b20b6e702593734363d976db38e739 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@
 ## 约束与限制
 
 1. 本示例仅支持标准系统上运行，支持设备：华为手机。
-2. HarmonyOS系统：HarmonyOS 6.0.0 Release及以上。
+2. HarmonyOS系统：HarmonyOS 5.1.1 Release及以上。
 3. DevEco Studio版本：DevEco Studio 6.0.0 Release及以上。
 4. HarmonyOS SDK版本：HarmonyOS 6.0.0 Release SDK及以上。
 5. 双端设备需要登录同一华为账号。
diff --git a/build-profile.json5 b/build-profile.json5
index 6c9ae38c951d40157decda38178d93b7f2fa7b29..40909c6bbd49b4da9d37a7d40ccd34dfd8e3d40c 100644
--- a/build-profile.json5
+++ b/build-profile.json5
@@ -6,7 +6,7 @@
         "name": "default",
         "signingConfig": "default",
         "targetSdkVersion": "6.0.0(20)",
-        "compatibleSdkVersion": "6.0.0(20)",
+        "compatibleSdkVersion": "5.1.1(19)",
         "runtimeOS": "HarmonyOS"
       }
     ],