1# Application Installation, Uninstall, and Update 2<!--Kit: Ability Kit--> 3<!--Subsystem: BundleManager--> 4<!--Owner: @wanghang904--> 5<!--Designer: @hanfeng6--> 6<!--Tester: @kongjing2--> 7<!--Adviser: @Brilliantry_Rui--> 8 9This topic describes application installation, uninstallation, and two update modes. 10 11## Installing or Uninstalling an Application 12You can install and uninstall applications using debug commands, for example, the [install](../tools/bm-tool.md#install) and [uninstall](../tools/bm-tool.md#uninstall) commands in the bm tool. For details, see the [compilation, release, and deployment process](./application-package-structure-stage.md#package-structure-in-the-release-phase) flowchart. 13 14**Figure 1** Process of installing and uninstalling an application (applicable to developers) 15 16 17 18 19After an application is released to AppGallery, users can install or uninstall the application on their devices through the AppGallery. 20 21**Figure 2** Process of installing and uninstalling an application (applicable to consumers) 22 23 24 25## Updating an Application 26 27 28For developers, you need to first update the **versionCode** field in the [app.json5FrF configuration file](./app-configuration-file.md), package the application using DevEco Studio, and release it on AppGallery. For users, you can update the application in either of the following ways after a new version is released: 29 30- On AppGallery: AppGallery notifies the user of an available update, and the user can install the update by following the on-screen instructions. 31- In the application: <!--RP1-->When the application for which an update is available starts up, it notifies the user of the update, and the user can install the update by following the on-screen instructions.<!--RP1End--> 32
