from the phone. Users are advised to use services like Google Photos or the OnePlus Switch app to secure their files before starting. The Local Update Tool
A warning will appear stating that all data will be wiped. Confirm and tap Install . downgrade oneplus 9 to android 11 exclusive
Path A — Official local rollback (recommended if OnePlus provides an official rollback package for your build): from the phone
OnePlus introduced ARB in Android 11 updates. The aboot and xbl partitions contain a rollback index. Attempting to flash an older index without modification triggers: Confirm and tap Install
fastboot reboot fastboot
Do not trust random torrents. Look for the file named: Rollback-OTA-OnePlus9-OxygenOS-11.2.2.2.zip or similar (size ~3.5GB).
Downgrading a OnePlus 9 device to Android 11 is a relatively straightforward process, but it does come with some risks, including data loss and potential issues with future updates. Before attempting to downgrade, make sure to backup your data and understand the risks involved. Additionally, keep in mind that downgrading may void your warranty, and you may not receive future updates or security patches.