Downgrade Oneplus 9 To Android 11

Ensure you download the EU zip file to avoid network compatibility issues.

: This process will erase all data on your phone. Back up your photos, contacts, and files before starting. Downgrade Oneplus 9 To Android 11

Once downloaded, move the rollback ZIP file from your "Downloads" folder to the root directory of your phone's internal storage (not inside any folders). If the file ends in or has extra characters, rename it to end simply in Initiate the Rollback: OnePlus Local Update app you installed. Settings (gear) icon in the top-right corner. Ensure you download the EU zip file to

When the phone boots up, you will see the classic OxygenOS 11 welcome screen. and files before starting. Once downloaded