To downgrade your to Android 11 (OxygenOS 11), you must use a specific rollback package. This process will erase all data on your device , so a full backup is essential before starting. Critical Pre-Downgrade Checklist Backup Data
: Ensure all photos, messages, and files are backed up to a cloud service like Google Photos or an external drive. Battery Level : Keep your device charged above to avoid power failure during the flash. Remove Security
: Disable any screen locks, fingerprints, or PINs to prevent encryption conflicts. Verify Model
: Download the correct rollback file for your specific region (IN, NA, or Europe) to avoid bricking your device. Method 1: Local Upgrade (Recommended)
This method is for functional devices running OxygenOS 12, 13, or 14. Download Files Android 11 Rollback Package OnePlus Local Update APK from the official OnePlus Community Rename Extensions If the rollback file ends in , rename it to end in If the local update tool ends in , rename it to end in Place Files : Move the rollback root directory of your phone's internal storage (not inside any folder). Install Tool : Install the Local Update APK and open it. Run Downgrade in the top right. Select the rollback file you moved to your storage. Confirm the warning that your data will be wiped. : Once finished, tap
. The device will boot into recovery, perform a factory reset, and then load OxygenOS 11. Method 2: MSM Download Tool (For Bricked Devices)
If your phone is stuck in a boot loop or the local update fails, use the MSM Download Tool on a Windows PC.
Downgrading your from OxygenOS 12 (Android 12) back to OxygenOS 11 (Android 11) involves using a "Rollback Package" and a specific update tool ⚠️ Critical Precautions Backup Everything: This process will completely erase all data on your phone. Battery Level: Ensure your phone is charged to at least (preferably 50%+) before starting. Official Files: Only use rollback packages from the official OnePlus Community or trusted developers to avoid bricking your device. Step-by-Step Downgrade Process Download Necessary Files: Rollback Package:
Download the Android 11 rollback ZIP file specific to your OnePlus 9 model and region (India, Europe, or North America). OnePlus Local Update Tool:
On Android 12, the standard "Local Install" option is often hidden. You may need to download and install the official OnePlus Local Update APK Prepare the Rollback File:
Once downloaded, move the rollback ZIP file from your "Downloads" folder to the root directory of your phone's internal storage (not inside any folders). If the file ends in or has extra characters, rename it to end simply in Initiate the Rollback: OnePlus Local Update app you installed. Settings (gear) icon in the top-right corner.
Select the rollback package you moved to the root directory.
A warning will appear stating that this will wipe your data. Tap Completion & Reboot: The installation will begin and usually takes about 10–15 minutes Once finished, tap
. Your phone will restart into the setup screen for Android 11. Troubleshooting "Local Install" Missing
If you cannot find the Local Install option in your standard settings: Settings > About Device > Version Build Number 7 times to enable Developer Options. If it still doesn't appear, use the MyApplication2.apk
provided by OnePlus specifically for downgrading from Android 12.
Did you run into any "Verification Failed" errors during the local install?
Post your device model and current OOS version below for help.
While the OnePlus 9 initially received praise for its flagship performance, many users eventually found that newer updates—specifically Android 12 and 13—introduced bugs, battery drain, or UI changes that felt less "OxygenOS" and more like Oppo's ColorOS. If you're missing the stability and sleekness of the original software, this guide will walk you through how to downgrade your OnePlus 9 to Android 11 (OxygenOS 11). Important: Read Before Proceeding
Complete Data Wipe: This process will irreversibly erase all your data, including photos, apps, and messages. Downgrade Oneplus 9 To Android 11
Battery Level: Ensure your phone is charged to at least 50% to avoid any shutdowns during the flashing process.
Regional Versions: Download the rollback package that matches your specific model (Global, India, or EU) to avoid network issues. Phase 1: Backing Up Your Data
Since your phone will be factory reset, you must secure your files first.
Google Account: Go to Settings > System > Backup and ensure Back up to Google Drive is toggled on.
OnePlus Clone Phone (formerly Switch): Use the OnePlus Clone Phone app to create a local backup of your contacts, logs, and messages.
Manual Media Transfer: Connect your phone to a PC and manually copy the DCIM and Pictures folders to your computer. Phase 2: Downloading the Rollback Files
You need two specific files: the Rollback Firmware and the Local Update APK (since the local update option is often hidden in Android 12/13). YouTube·Altered Tech How to Downgrade from OxygenOS 12 to OxygenOS 11
If you're missing the stability or features of earlier OxygenOS versions, you can downgrade your Go to product viewer dialog for this item.
to Android 11. This process is useful for troubleshooting bugs or preparing for custom ROM installations, but it will completely wipe your device. Essential Prerequisites
Before beginning, ensure you meet these requirements to avoid bricking your device:
Backup Everything: All data, including photos, contacts, and messages, will be permanently deleted.
Battery Level: Ensure your phone is charged to at least 30% (60% is recommended) to prevent power loss during the flash.
Correct Firmware: Download the specific rollback package for your region (IN, NA, or Europe).
Developer Options: Enable these by going to Settings > About Device > Version and tapping "Build Number" seven times. How to Downgrade (Local Upgrade Method)
This is the standard method for users currently on a stable version of OxygenOS 12 or 13. 1. Prepare the Files
Download the official OnePlus 9 Android 11 Rollback Package for your region. If the file ends in .jar, rename it to end in .zip.
Move the file to the root directory of your phone's internal storage (outside all folders). 2. Install the "Local Update" Tool
OnePlus removed the local install option in newer updates. You must download and install the OnePlus Local Update APK to restore this feature. Download the APK from the OnePlus Community forums.
If it downloads as a .zip, rename it to .apk before installing. 3. Execute the Rollback [CLOSED] Roll back - OnePlus Community To downgrade your to Android 11 (OxygenOS 11),
To downgrade your OnePlus 9
to Android 11 (OxygenOS 11), you must use a specific Rollback Package. ⚠️ Critical Warnings
Data Wipe: This process will erase all data on your phone. Back up your photos, contacts, and files before starting.
Regional Accuracy: You must use the rollback file that matches your specific model (IN, NA, or Europe). Step 1: Download Required Files
Rollback Package: Visit the OnePlus Community forums or official support pages to download the correct OxygenOS 11 rollback zip for your region (India, North America, or Europe).
Local Update APK: Since newer OxygenOS versions (12+) often hide the "Local Upgrade" option, you may need to install the OnePlus Local Update Tool. Step 2: Prepare the Package
Move the File: 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).
Rename (If needed): Ensure the file ends in .zip. If it ends in .jar, rename it to remove the .jar suffix. Step 3: Install the Downgrade Open the Tool: Open the Local Update APK you installed.
Select the Package: Tap the gear icon (top right) and select the rollback package you moved to the root directory.
Confirm & Install: The system will warn you that this will reset the device. Tap Confirm.
Reboot: Once the installation reaches 100%, tap Reboot. Your phone will restart into the initial setup for OxygenOS 11. Why People Downgrade Users often revert to Android 11 for: Stability: Fixing bugs found in later OxygenOS versions.
Interface Preference: Returning to the "classic" OnePlus UI before the merger with ColorOS.
Performance: Resolving battery drain or heating issues caused by newer updates. If you'd like, I can help you find:
The exact download link for your specific region (IN, NA, or EU).
Tips on how to stop automatic updates once you're back on Android 11. The best backup tools to use before you wipe the device.
Downgrading a Go to product viewer dialog for this item. to Android 11 involves using a "Rollback Package" and a manual installation method known as Local Install. This process will wipe all data from your device, so ensure you have a complete backup before starting. Prerequisites
Backup Your Data: The downgrade acts as a factory reset, deleting all apps, photos, and files.
Battery Level: Ensure your device has at least 30% battery to prevent it from shutting down mid-process.
Rollback Firmware: You must download the correct Android 11 rollback package for your specific region (Global, India, or NA). Step-by-Step Instructions Troubleshooting Common Errors Credits
Download the Package: Download the official OxygenOS 11 rollback ZIP file to your phone's internal storage.
Enable Developer Options: Go to Settings > About Device > Version and tap Build Number 7 times. Access Local Install:
Navigate back to Settings > System > Software Update (or About Device > OxygenOS). Tap the three dots in the top right corner. Select Local Install.
Note: If "Local Install" is missing, you may need to install the OnePlus Local Update APK specifically designed for newer OxygenOS versions.
Select the File: Choose the rollback ZIP file you downloaded. A warning will appear stating that your data will be erased.
Confirm and Install: Tap Confirm. The process usually takes 7–10 minutes.
Reboot: Once finished, tap Reboot. Your device will boot into the setup screen for Android 11. Important Considerations
Security Risks: Android 11 is no longer officially supported by Google with security updates, leaving the device more vulnerable to new threats.
Update Loop: To stay on Android 11, you must disable Auto-update in the system settings; otherwise, the phone will immediately prompt you to update back to Android 12 or 13.
Title: Turning Back Time: A Guide to Downgrading the OnePlus 9 to Android 11
The OnePlus 9 series, powered by the formidable Snapdragon 888, was a flagship contender that launched with Android 11 out of the box. Over time, OnePlus pushed significant updates, eventually landing on Android 12, 13, and beyond, often with the much-debated ColorOS (or OxygenOS based on ColorOS) merger.
While newer software usually means better features, many users find themselves preferring the clean, lightweight aesthetic of OxygenOS 11 or seeking to escape battery drain and bugs introduced in later updates. If you are looking to revert your device to its "golden age" of software, here is an informative breakdown of the process, the risks, and the rewards.
OnePlus officially provides "Rollback Builds" (downgrade packages) for users who want to revert from beta or stable Android 12/13/14 to Android 11.
Where to find them:
Example file name: Rollback_OxygenOS_11.2.10.10.LE15DA_210923.ozip
If your phone soft-bricks or the local upgrade fails, the MSM Download Tool (OnePlus’s internal unbrick tool) can flash Android 11 directly. This requires a PC and putting your phone into EDL mode (Qualcomm Emergency Download). This voids no warranty but is riskier if you choose the wrong package.
Proceed with MSM only if you are comfortable with command-line tools.
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.
