This article is for educational purposes. The author is not responsible for bricked devices, voided warranties (note: unlocking bootloader voids warranty in most regions), or data loss.
or 9 Pro) and region from sources like the OnePlus Community forums or SourceForge . Find the downloaded file in your file manager. If it ends in .jar , rename it to end in .zip .
This can happen if you flashed an India‑specific MSM tool on a non‑India device. The phone may boot to Android 12 and then say it is “up to date,” blocking further upgrades. Find the correct MSM tool for your true region and reflash. In some cases, you may need to use a “conversion” package to first revert the region identifier.
: 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 downgrade oneplus 9 to android 11 exclusive
(via ADB):
Because Android 12 and 13 remove the built-in local installation button, you must use the official OnePlus system update APK.
Below is a for performing the downgrade safely — with key warnings, steps, and tools. This article is for educational purposes
OnePlus 9 (LE2110, LE2111, LE2113, LE2115, LE2117) Target OS: OxygenOS 11.2.10.10 / 11.2.20.20 (Android 11) Prerequisite: Unlocked Bootloader (Mandatory for cross-version rollback)
Once the installation reaches 100%, tap Reboot . The device will boot into recovery mode, perform a factory reset, and then restart into OxygenOS 11. Android 11 Go to product viewer dialog for this item. (OxygenOS 11) Android 12 13 (OxygenOS 12+) Stock-like, "pure" OnePlus ColorOS-integrated design Generally more stable for Go to product viewer dialog for this item. Some reports of bugs/lag Original OnePlus camera app Newer ColorOS-based camera app Oneplus 9 Pro | Downgrade to OXYGEN OS 11
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Find the downloaded file in your file manager
Download and install the official (often called the System Update Tool). Open the newly installed System Update app . Tap the Gear Icon in the top right corner. Select the rollback .zip file from your root directory.
You have successfully downgraded to Android 11. Congratulations. But OnePlus will immediately try to push Android 12 to your phone via notification.
the device during this process. It will take roughly 10–15 minutes. Phase 3: Finalizing Once completed, the phone will reboot into Android 11. Follow the initial setup. Post-Downgrade: Ensuring You Stay on 11
After completion, disconnect the USB cable and power on your OnePlus 9. The first boot will take 5–10 minutes as Android 11 initializes.