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This process will completely wipe your device. Backup all photos, contacts, and documents to a cloud service or external PC.
Click to begin the process. The system will now wipe your device and flash Android 11. downgrade oneplus 9 to android 11 exclusive
Downgrading will wipe all data on your phone. This process is irreversible via OTA updates (you will need to manually upgrade again if you change your mind). Proceed at your own risk. This process will completely wipe your device
If you are currently on Android 13 or 14 and need to rollback, the process is similar but may require a two-step rollback process (13 -> 12 -> 11). If you have encountered specific errors during this downgrade, please share the error message in the comments below! Frequently Asked Questions downgrade oneplus 9 to android 11 exclusive