Then, the OnePlus boot logo appeared. Not the new ColorOS one. The old, familiar, reassuring logo.
: To stay on Android 11, you must disable Auto-update in the system settings; otherwise, the phone will immediately prompt you to update back to Android 12 or 13. Downgrade Oneplus 9 To Android 11
Example file name: Rollback_OxygenOS_11.2.10.10.LE15DA_210923.ozip Then, the OnePlus boot logo appeared
Since your phone will be factory reset, you must secure your files first. Downgrade Oneplus 9 To Android 11
It retains the distinct OxygenOS identity before the heavy integration with OPPO's ColorOS. Reliable Features: Fixed bugs related to Android Auto