. The phone will perform a factory reset and boot into the OxygenOS 11 setup screen. Troubleshooting & Tools
Connect your phone to a PC and manually copy the DCIM and Pictures folders to your computer. Phase 2: Downloading the Rollback Files Downgrade Oneplus 9 To Android 11
Copy the downloaded .ozip rollback file (do not rename or extract it) to the of your phone's internal storage. Do not put it inside any folder (e.g., Downloads or Documents). Downloads or Documents).