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Rolling Back: How to Downgrade Your OnePlus 9 to Android 11
Whether you’re missing the classic OxygenOS experience or troubleshooting bugs in newer versions, rolling back your
to Android 11 (OxygenOS 11) is a common move for enthusiasts. However, this process is high-stakes; it will completely wipe your phone, so a full external backup is mandatory before you begin. Essential Pre-Flight Checklist
Backup Everything: Move all photos, contacts, and documents to a PC or cloud storage, as the downgrade performs a mandatory factory reset.
Battery Level: Ensure your device is charged to at least 30% (though 60% is safer) to prevent a shutdown during flashing.
Carrier Check: This guide is primarily for unlocked/non-carrier variants. Carrier-locked models (like T-Mobile) often block local upgrades and may require specialized tools like the MSM Download Tool. Step-by-Step Downgrade Process
The most reliable "exclusive" method uses the official rollback packages provided by OnePlus through a local upgrade application. 1. Download the Rollback Package
You must download the specific OxygenOS 11 rollback ZIP file for your region (IN, NA, or EU). You can often find these in the official OnePlus Community forums.
Pro Tip: If the downloaded file ends in .jar, rename it to .zip before proceeding. 2. Install the Local Update APK downgrade oneplus 9 to android 11 exclusive
Newer versions of OxygenOS often hide or remove the "Local Upgrade" option from the settings menu. You may need to install the OnePlus Local Update APK to restore this functionality.
Once installed, open the app and look for the gear icon in the top-right corner. 3. Initiate the Rollback
Move the downloaded rollback package to the root directory of your phone's internal storage (not inside any folder). Open the Local Update app and tap the gear icon. Select the rollback ZIP file from the list.
Confirm the installation. The phone will verify the file and then begin the process, which usually takes 5–10 minutes. 4. Reboot and Setup
After the installation finishes, tap Reboot. Your device will boot into recovery, perform a factory reset, and eventually start up with the OxygenOS 11 setup screen.
Rollback Oneplus 6 & 6T from Oxygen OS 11.1.1.1 to Oxygen OS 10 Stable
To downgrade your Android 11 (OxygenOS 11) , you must use a rollback package. This process will wipe all your data , so ensure you have a full backup before proceeding. 1. Preparation Backup Your Data
: Move photos, videos, and documents to a computer or cloud storage. Charge Your Device : Ensure your phone has at least 30%–50% battery to prevent it from shutting down during the process. Enable Developer Options Settings > About Device > Version and tap on Build Number seven times until "Developer mode" is active. 2. Download the Files You need two specific files: the Rollback Firmware Local Update APK
(required because newer Android versions often hide the local update option). Rollback Packages
: Obtain the correct package for your region (IN, NA, or Europe) from the official OnePlus Community forums Local Update Tool : Download the Official OnePlus Local Update APK 3. Setup the Files Rename the Local Update APK : If the tool downloads as a , rename it to end in and install it on your phone. Rename the Firmware : If your rollback package ends in , rename it to end in : Move the renamed firmware file to the Root Directory fastboot wipe-super super_empty
of your internal storage (the main folder, not inside any specific folder like "Downloads"). 4. Execute the Downgrade Local Update app you just installed. (settings) in the top right corner. Select the rollback package you moved to your root directory. A warning will appear stating that this will factory reset your device. Confirm the installation. Wait for the progress bar to reach 100%, then tap Troubleshooting: MSM Download Tool
If your device becomes unresponsive or the local update method fails, you can use the MSM Download Tool on a Windows PC.
Download the MSM tool specific to your OnePlus 9 variant from XDA-Developers Power off your phone, hold Volume Up + Volume Down , and connect it to your PC to enter
The tool will detect the device as "Qualcomm HS-USB QDLoader 9008" and flash the factory Android 11 image. Oneplus 9 Pro | Downgrade to OXYGEN OS 11
Downgrading OnePlus 9 to Android 11: A Step-by-Step Guide
The OnePlus 9 series was launched with Android 11 out of the box, and later received updates to Android 12 and even Android 13. However, there may be reasons why you want to downgrade your OnePlus 9 to Android 11. Perhaps you prefer the older version's interface, or maybe you encountered issues with the newer versions. Whatever the reason, downgrading can be a bit tricky, but we're here to guide you through it.
Preparation
Before you begin, make sure you:
Downgrade Process
To downgrade your OnePlus 9 to Android 11, you'll need to follow these steps: If you'd like, I can also help you:
| Component | Source | Purpose |
|-----------|--------|---------|
| MSM Download Tool (Guacamole) | OnePlus Service ROM | Emergency recovery (backup) |
| Platform Tools (v33.0.3+) | Google | Fastbootd support |
| OxygenOS 11 Full OTA (ZIP) | OnePlus Community | Extract payload.bin |
| Payload Dumper | GitHub (ssut) | Extract raw images |
| Modified vbmeta.img | Custom build | Disables ARB checks |
| Python 3.10 | python.org | Scripting flash sequence |
Android 12 updates the modem firmware (DSP, ADSP, modem). Android 11’s modem expects older signatures. A mismatch leads to:
Solution: Exclusive flash of modem, dsp, aop, and tz partitions from the exact Android 11 build matching your region.
Once on Android 11, apply these to prevent forced updates:
If your phone is bootlooping, or if the local upgrade fails with "verification error," you need the MSM Download Tool. This is the factory tool OnePlus service centers use. It is the nuclear option.
Best for: Bricked phones or complete clean flash to Android 11.
This completely resets everything, including locking the bootloader if it was unlocked.
Before we dive into the how, let’s validate the why. You aren’t alone. Community forums are flooded with complaints:
If these issues plague you, downgrading to Android 11 is your only escape.