Downgrade Oneplus 9 To Android 11

| Action | Why It Matters | |--------|----------------| | Disable automatic system updates | Go to Settings → System → System Updates → Disable "Auto-download over Wi-Fi" | | Check for correct baseband | Dial *#*#786#*#* – ensure your IMEI is intact (should be fine with official rollback) | | Reinstall camera app updates | Open Google Play → Update OnePlus Camera – the rollback ships with an older version | | Test critical functions | Wi-Fi, Bluetooth, fingerprint sensor, and alert slider |

Download the official OOS 11 downgrade ZIP for your region from OnePlus’s servers:

| Region | Build Number | Download Link | |--------|--------------|----------------| | Global (IN/EU/NA) | 11.2.10.10 | [Link placeholder] | | India | 11.2.10.10.IN11DA | [Link placeholder] | | EU | 11.2.10.10.EU | [Link placeholder] |

Verify SHA256 after download.

If your OnePlus 9 is already bricked, stuck in a boot loop, or the local update method fails, you need the MSM Download Tool. This is a PC-based utility that flashes the phone back to factory Android 11.

Warning: This tool is for emergency use only. It wipes everything and restores the phone to exactly how it left the factory. Downgrade Oneplus 9 To Android 11

Yes, if:

No, if:

Have you downgraded your OnePlus 9? Share your experience in the comments. For official support, visit OnePlus Community forums.

Disclaimer: This guide is for informational purposes. The author and platform are not responsible for bricked devices, lost data, or voided warranties (though using official rollback packages does not void warranty). Always double-check your model number before proceeding.

How to Downgrade Your OnePlus 9 to Android 11 (OxygenOS 11) If you've updated your OnePlus 9 to Android 12 or 13 and found it buggy or simply prefer the classic OxygenOS experience, you can roll back to Android 11. This process is official but will completely wipe your phone, so a full backup is essential before starting. Prerequisites | Action | Why It Matters | |--------|----------------|

Backup Your Data: Moving to an older version of Android requires a factory reset. Use cloud services or a computer to save your photos, contacts, and documents.

Battery Level: Ensure your device has at least 30% battery to prevent it from shutting down mid-process.

Rollback Package: Download the specific OxygenOS 11 rollback ZIP for your region (IN, NA, or Europe) from the official OnePlus Community. Step 1: Install the Local Update Tool

OxygenOS 12 and 13 often hide the "Local Upgrade" option. To get it back, you need to install a specific APK provided by OnePlus. Download the OPLocalUpdate APK.

If the file downloaded as a .zip, use a file manager to rename it, removing the .zip extension so it ends in .apk. Install and open the app. Step 2: Perform the Rollback Download the official OOS 11 downgrade ZIP for

Move the downloaded Android 11 rollback ZIP file to the root directory of your phone's internal storage (do not leave it in the "Downloads" folder). Open the Local Update app you just installed. Tap the gear icon in the top-right corner.

Select the rollback package you moved to the root directory.

Confirm the installation. The phone will verify the package and then begin the downgrade. Step 3: Finalize and Setup

Once the installation finishes, your phone will prompt you to Restart. It will boot into recovery mode, perform a factory reset, and then restart into the OxygenOS 11 setup screen. Alternative: The MSM Download Tool

Cause: You are trying to downgrade from Android 13 or OxygenOS 13.1 directly to Android 11. Fix: You must first downgrade to Android 12 (OxygenOS 12) using an intermediate rollback package, then downgrade to Android 11. OnePlus blocks direct major version downgrades.