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+# Guide to Switching to Full SDK
+
+Both the public SDK and full SDK are toolkits for application development. 
+
+The public SDK is intended for application developers and provided as standard in DevEco Studio. It does not contain system APIs – APIs required by system applications.
+
+The full SDK is intended for original equipment manufacturers (OEMs) and provided separately. It contains system APIs.
+
+The SDK of API version 8 provided in DevEco Studio is a public SDK. If your project depends on any system API, such as the **animator** component, **xcomponent** component, or APIs in **@ohos.application.abilityManager.d.ts**, **@ohos.application.formInfo.d.ts**, or **@ohos.bluetooth.d.ts**, switch to the full SDK by performing the following steps.
+
+## Downloading the Full SDK (of 3.1.1 Release in this example)
+
+Manually download the full SDK. For details, see the source code acquisition section in [OpenHarmony 3.1.1 Release](https://gitee.com/openharmony/docs/blob/master/en/release-notes/OpenHarmony-v3.1.1-release.md).
+
+![image-20220613161049897](figures/en-us_image_0000001655128646.png)
+
+
+
+
+## Checking the Local SDK Location<br>In this example, an eTS project is used. For a JS project, replace **ets** with **js**.
+
+In DevEco Studio, choose **Tools** > **OpenHarmony SDK Manager** to check the location of the local SDK.
+
+![](figures/en-us_image_0000001655128939.png)
+
+![image-20220613160524053](figures/en-us_image_0000001655128998.png)
+
+
+## Replacing the SDK
+
+1. Make sure the downloaded SDK is a full SDK.
+
+   a. Verify that the name of the downloaded file contains **sdk-full**.
+
+   ![image-20220613220702504](figures/en-us_image_0000001655129232.png)
+
+   b. Verify that the SDK contains system APIs (such as APIs defined in **@ohos.application.abilityManager.d.ts**, **@ohos.application.formInfo.d.ts**, and **@ohos.bluetooth.d.ts**).
+
+   Note: The criteria for identifying system APIs are subject to the released API documentation.
+
+   
+
+2. Replace the SDK. The following uses full SDK 3.1.6.6 for Windows as an example.
+
+    
+
+   a. Decompress the downloaded full SDK file: `ets-windows-3.1.6.5-Release.zip`
+
+   ![image-20220613165018184](figures/en-us_image_0000001655129264.png)
+
+   b. Replace the SDK files.
+
+   Back up the local SDK files. (Copy and rename the version number directory in the **ets** directory, or copy the entire **ets** directory to another local path.)
+
+   Go to the obtained location of the local installed SDK and back up the files therein.
+
+   ![image-20220613161352157](figures/en-us_image_0000001655129041.png)
+
+   Note: The name of the backup version number directory must be different from the value of **version** field in the **oh-uni-package.json** file. In the example below, the name of the backup version number directory is **3.1.6.6_backup**.
+
+   ![image-20220613165018184](figures/en-us_image_0000001655129398.png)
+
+   The configuration in the **oh-uni-package.json** file is as follows:
+
+   ```
+   {
+     "apiVersion": "8",
+     "displayName": "Ets",
+     "meta": {
+       "metaVersion": "3.0.0"
+     },
+     "path": "ets",
+     "releaseType": "Release",
+     "version": "3.1.6.6"
+   }
+   ```
+
+   **Delete all files in the original SDK (3.1.6.6) directory.** Failure to do so may result in some files being unable to be overwritten.
+
+   
+
+   Copy the full SDK to the location of the local SDK.
+
+   Copy all files in the **ets** directory in the full SDK to the **ets\3.1.6.6** directory in the location of the local SDK.
+
+   Change the value of **version** in the **oh-uni-package.json** file to the current SDK version number.
+
+   
+
+   In the **3.1.6.6\build-tools\ets-loader** directory, open the **cmd/powerShell** window and run the **npm install** command to download the **node_modules** dependency package.
+
+   ![image-20220613171111405](figures/en-us_image_0000001655129333.png)
+
+   
+
+   c. Check for system APIs.
+
+   ![image-20220613213038104](figures/en-us_image_0000001655129372.png)