To downgrade your Go to product viewer dialog for this item.

The super partition must be erased and recreated using fastboot delete-logical-partition commands before flashing raw images.

Reports suggest better call quality, specifically regarding VoLTE and VoWiFi stability, on the older firmware. ⚠️ Pre-Rollback Checklist Oneplus 9 Pro | Downgrade to OXYGEN OS 11

: Move all photos, contacts, and documents to a PC or cloud storage, as the downgrade performs a mandatory factory reset.