Downgrade Oneplus 9 To Android 11 Exclusive

Move the .zip Rollback Firmware to the of your phone's internal storage (not inside any folders). Phase 2: Installing the Rollback (Downgrade) Open the OnePlus Local Update application you installed. Tap the Gear Icon in the top right corner.

Tap the or the Three Dots in the top-right corner. Select Local Upgrade . downgrade oneplus 9 to android 11 exclusive

Downgrading to Android 11 on the OnePlus 9 is a temporary escape, not a solution. It fixes software annoyances but introduces security holes and app rot. If OxygenOS 11 was “the last good version,” consider a custom ROM like crDroid or Pixel Experience (Android 13/14) instead—same clean feel but up-to-date patches. Only go back to stock Android 11 as a last resort or for a short-term test. Move the