Downgrade Oneplus 9 To Android 11 Exclusive -

Copy all personal files, photos, and app data to an external storage or cloud service, as the phone will be factory reset.

Once the installation reaches 100%, tap Reboot . The device will boot into recovery, perform a factory reset, and then start up with OxygenOS 11. Phase 3: Alternative Method (MSM Download Tool) downgrade oneplus 9 to android 11 exclusive