Find the official rollback package (a .zip file) for your specific regional OnePlus 9 model from the OnePlus Community Forums .
If prompted, grant your browser or file manager permission to Step 3: Executing the Downgrade Process
Prerequisites and preparatory steps
: Once the rollback zip is downloaded, move it to the root directory of your phone's internal storage (do not put it in a folder). Downgrade Oneplus 9 To Android 11
The OnePlus 9 series launched to critical acclaim in 2021, primarily for its Hasselblad-tuned cameras and blazing-fast Snapdragon 888 chipset. However, for many users, the magic lived in —the operating system that shipped with the device out of the box.
Depending on whether your OnePlus 9 is currently running Android 12 or Android 13, the standard system update screen may completely lack the "Local Upgrade" option. OnePlus removed this default feature in newer OxygenOS iterations. To bypass this restriction, you will need to install the official OnePlus local update tool APK.
Here are the links to the Android 11 downgrade packages for the OnePlus 9 series: Find the official rollback package (a
Newer OxygenOS versions (Android 12/13/14) often hide the "Local Update" option. You must install a standalone Local Update APK to bypass this. 2. Prepare the Files
To prevent your OnePlus 9 from immediately downloading Android 12 or 13 again, you need to turn off automatic system updates. Go to . Tap the Gear Icon in the top right corner. Toggle OFF the "Auto-download over Wi-Fi" option.
Place the .zip file in the of your internal storage (not inside any folder). 3. Install the Rollback However, for many users, the magic lived in
Install the OnePlus ROM Upgrade APK file on your device. Execute the Rollback: Open the newly installed app. Select the .zip rollback file you transferred earlier. Click on Install or Confirm . Once complete, the phone will prompt you to restart. Reboot: Click Reboot to start the rollback process. Phase 3: Completing the Downgrade
Are you encountering a during the local upgrade process?
: If you plan to use a PC, install the official OnePlus USB drivers so your computer can communicate with your device. You can find these on the OnePlus official support site.
The OnePlus local upgrade tool can only detect the installation file if it sits in the primary storage folder. Open the native app on your OnePlus 9.