Downgrade — Oneplus 9 To Android 11 [best]

: The system will warn you that this will reset the device. Tap Confirm .

Copy the downloaded Android 11 rollback .zip file from your computer. Downgrade Oneplus 9 To Android 11

Connect your phone to your computer or use the built-in Files app. : The system will warn you that this will reset the device

Place the .zip file in the of your internal storage (not inside any folder). 3. Install the Rollback Downgrade Oneplus 9 To Android 11