Android 11 ^new^: Downgrade Oneplus 9 To

Your phone will scan the internal storage. You should see the rollback .ozip file appear. Tap on it. The system will verify the package. This takes 30-60 seconds.

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Before we dive into the process, let's discuss some reasons why you might want to downgrade to Android 11: Downgrade Oneplus 9 To Android 11

Here are the links to the Android 11 downgrade packages for the OnePlus 9 series: Your phone will scan the internal storage

Open the File Manager and move the downloaded Android 11 rollback .zip file from the Downloads folder to the (the main folder outside of all other folders). Go to Settings > System > System Updates . Tap the Gear Icon in the top right corner. Select Local Upgrade . Tap on the Android 11 rollback zip file you just moved. The system will verify the package

On newer OxygenOS versions, the standard "Local Upgrade" option may be hidden. You might need to download and install the OnePlus Local Update APK to perform the manual install. Prepare the Files: