Android 11 uses a classic partition layout; Android 12+ uses a super partition (logical volumes for system, product, vendor). Direct flashing of Android 11 images fails due to size mismatches.
Solution: The super partition must be erased and recreated using fastboot delete-logical-partition commands before flashing raw images.
fastboot reboot fastboot
You need a file specific to your model:
fastboot --disable-verity --disable-verification flash vbmeta vbmeta_mod.img
fastboot erase metadata
fastboot erase userdata
Downgrading the OnePlus 9 to Android 11 is technically demanding, requires an unlocked bootloader, and permanently sacrifices SafetyNet and Widevine L1. However, for users prioritizing:
This exclusive downgrade path remains the only solution. Not recommended for daily drivers unless you have a spare device and Qualcomm EDL cables.
Last tested: OnePlus 9 LE2115_11_C.15 (Android 11) downgraded from LE2115_13_F.75 (Android 13).
To downgrade your to Android 11 (OxygenOS 11), you must follow a specific rollback procedure. This process is necessary because standard system update settings often lack a direct "downgrade" button.
Critical Warning: This process will completely and irreversibly wipe all data on your phone. Ensure you have a full backup stored on a PC or cloud service before proceeding. Phase 1: Preparation Check Battery: Ensure your device has at least 50% charge. Download Required Files:
Rollback Package: Download the specific Android 11 rollback ZIP for your model (OnePlus 9 or 9 Pro) and region (Global, India, or Europe) from official OnePlus Community threads.
Local Update APK: Since OxygenOS 12 and 13 often hide the local upgrade option, you may need a dedicated Local Update APK to facilitate the flash. Prepare Files: downgrade oneplus 9 to android 11 exclusive
If the rollback file ends in .jar, rename it to remove the .jar extension so it ends in .zip.
Move the rollback .zip file to the root directory of your phone's internal storage (do not put it in any folder). Phase 2: Execution (Local Upgrade Method) This is the standard official method for a working device.
Enable Developer Options: Go to Settings > About Device > Version and tap Build Number 7 times.
Install the Tool: Install and open the Local Update APK you downloaded. Select the Firmware: Tap the gear icon (settings) in the top-right corner.
Find and select the Android 11 rollback .zip file you placed in the root directory.
Confirm and Install: A warning will appear stating that all data will be wiped. Confirm and tap Install.
Reboot: Once the installation reaches 100%, tap Reboot. The device will boot into recovery, perform a factory reset, and then start up with OxygenOS 11. Phase 3: Alternative Method (MSM Download Tool)
If your device is bricked or the local upgrade fails, use the MSM Download Tool. This is a powerful PC-based utility that flashes the phone in EDL (Emergency Download) Mode. How to Unbrick OnePlus 9/9 Pro/9R via MSM Download Tool
Downgrade OnePlus 9 to Android 11: A Step-by-Step Guide
The OnePlus 9 series was launched with great fanfare, boasting impressive specs and features, including Android 12 out of the box. However, not everyone may be thrilled with the latest operating system, and some users might want to downgrade their device to Android 11. If you're one of them, you're in the right place. In this article, we'll walk you through the process of downgrading your OnePlus 9 to Android 11, exclusively. Android 11 uses a classic partition layout; Android
Why Downgrade to Android 11?
Before we dive into the process, let's discuss some reasons why you might want to downgrade to Android 11. Perhaps you're not a fan of the new features in Android 12, or maybe you're experiencing bugs or performance issues that weren't present in Android 11. Whatever the reason, downgrading can be a good option.
Preparation is Key
Before you begin, make sure you have the following:
Downgrade OnePlus 9 to Android 11: Step-by-Step Guide
To downgrade your OnePlus 9 to Android 11, follow these steps carefully:
Step 1: Unlock Your Bootloader
Step 2: Download Android 11 Firmware
Step 3: Boot into Fastboot Mode
Step 4: Flash Android 11 Firmware
Step 5: Perform a Factory Reset
Step 6: Boot into Android 11
Post-Downgrade Steps
Risks and Consequences
Downgrading your device can have some risks and consequences, including:
Conclusion
Downgrading your OnePlus 9 to Android 11 can be a bit tricky, but with the right guidance, you can achieve it. Make sure to follow the steps carefully and take necessary precautions to avoid any risks or consequences. If you're not comfortable with the process, it's recommended to stay with Android 12 or wait for future updates.
Exclusive: Tips and Tricks for Android 11 on OnePlus 9
If you've successfully downgraded to Android 11, here are some tips and tricks to enhance your experience:
By following this guide, you'll be able to downgrade your OnePlus 9 to Android 11 exclusively. However, we recommend you to proceed with caution and consider the risks and consequences before making any changes to your device. You need a file specific to your model:
Best for: Bricked phones or complete clean flash to Android 11.
This completely resets everything, including locking the bootloader if it was unlocked.