2. If you want to delete some other files, you can directly use the file cleaning function that comes with Xiaomi mobile phone to clean them. Methods: Open the mobile phone-security center-garbage cleaning-deep cleaning. After scanning some large files, check whether the files are useless cache files, and if so, delete them. Be sure to confirm that it is useless before deleting it, otherwise some applications may not be used normally. For example, deleting the navigation map package will make it impossible to navigate offline, and deleting the game package will make it impossible to start the game.