Downgrade Oneplus 9 To Android 11 -
Downgrading will erase everything on your phone (photos, contacts, apps, settings). Backup all data to a computer or cloud storage immediately.
Your OnePlus 9 will shut down and begin its initial boot sequence into OxygenOS 11.
If your phone fails to pass the boot animation screen after 20 minutes, your user data partition may not have cleared out properly.
If you are unhappy with the performance, battery life, or UI changes in recent updates, you can downgrade your Go to product viewer dialog for this item.
, which is a specialized utility for unbricking and deep downgrades via a Windows PC. This requires a computer and puts the phone into "EDL mode" by holding both volume buttons while connecting it via USB. Oneplus 9 Pro | Downgrade to OXYGEN OS 11 Downgrade Oneplus 9 To Android 11
Downgrading your OnePlus 9 to Android 11 (OxygenOS 11) is a common move for users looking for better stability or a specific interface style This process will completely wipe your phone , so ensure you have a full backup before starting. Pre-Downgrade Checklist Backup Everything:
Your phone will take longer than usual to boot up for the first time. Once it boots into Android 11, you will see the classic OxygenOS setup wizard.
: 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).
Ensure your OnePlus 9 has at least 60% battery charge to prevent the phone from powering off mid-process. Downgrading will erase everything on your phone (photos,
What (12 or 13) your phone is running The exact model number from your settings Any error messages that popped up I can give you specific steps to get past the issue. Share public link
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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
The MSM (MsmDownloadTool) is a low-level flashing program that uses your phone's Emergency Download Mode (EDL) to communicate directly with the device's processor, bypassing the operating system entirely to flash a stock ROM. If your phone fails to pass the boot
Download the specific rollback package for your region (NA, IN, or EU) . Steps to Downgrade via Local Update
Ensure your phone has at least 50% charge to prevent it from shutting down mid-process .
Ensure your two-factor authentication (2FA) apps are backed up or temporarily disabled so you do not get locked out of your accounts after the reset. 2. Verify Your Device Model