Because Android 12 and 13 remove the built-in local installation button, you must use the official OnePlus system update APK.
When the phone boots up, you will see the classic OxygenOS 11 welcome screen.
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. downgrade oneplus 9 to android 11 exclusive
Android 12 brought a host of new features, including a revamped UI, improved performance, and enhanced security. However, some users may have experienced issues with the new operating system, such as:
With patience and careful preparation, you can successfully downgrade your OnePlus 9 to Android 11 and enjoy the smooth, stable software experience that made the device so popular in the first place. Because Android 12 and 13 remove the built-in
OxygenOS 11 is highly optimized for the Snapdragon 888.
Official OnePlus rollback packages from the company “will erase all the content”. While third-party tools claim to offer data preservation, they are risky and not recommended. Always plan on a full data wipe. This process is irreversible via OTA updates (you
Yes, if you unlock your bootloader, you can flash an AOSP-based Android 11 ROM, but the official rollback is recommended for stability.
This guide provides a step-by-step walkthrough to safely downgrade your OnePlus 9. Pre-Downgrade Checklist
you downloaded. You may need to enable "Install from Unknown Sources" in your security settings. Initiate Rollback Local Update
Ensure you back up two-factor authentication (2FA) apps like Google Authenticator. 2. Check Device Prerequisites