fastboot reboot fastboot
. This app restores the gear icon in your update settings, allowing you to manually select a firmware file. Renaming Files downgrade oneplus 9 to android 11 exclusive
to Android 11 (OxygenOS 11), you must use a specific provided by OnePlus . This process will erase all data on your phone, so backing up your files is essential. Preparation fastboot reboot fastboot
Because Android 12 and 13 remove the built-in local installation button, you must use the official OnePlus system update APK. downgrade oneplus 9 to android 11 exclusive