If you decide to proceed, ensure you're comfortable with the process, take necessary precautions like backing up your data, and understand that you're doing so at your own risk.
Downgrading your OnePlus 9 to Android 11 is a straightforward process using the official Local Update method. While it requires a full backup and a careful download, the result is a return to the fluid, battery-efficient, and camera-focused OxygenOS that made the OnePlus 9 a fan favorite. Downgrade Oneplus 9 To Android 11