You need the specific rollback package tailored for your region and model.
With your data backed up, your battery charged, and your files correctly positioned, you are ready to initiate the rollback.
The downgrade process completely erases your internal storage, including apps, photos, messages, and contacts. Back up everything to a cloud service or a computer before moving forward.
This article provides a comprehensive guide on how to successfully downgrade your OnePlus 9 or 9 Pro to Android 11. ⚠️ Crucial Warnings Before You Proceed Downgrade Oneplus 9 To Android 11
. Your phone will restart into the setup screen for Android 11. Troubleshooting "Local Install" Missing
The official downgrade method uses a local update package (.OZIP file). You an unlocked bootloader. If you unlocked it previously, be aware that after downgrade, you will need to re-lock it for full banking app functionality (or keep it unlocked).
The process requires specific "rollback" packages and occasionally a "Local Update" APK, as the option is often hidden in newer menus. Critical Warning (Anti-Rollback): You need the specific rollback package tailored for
Now that you're prepared, let's dive into the step-by-step guide:
If you'd like to narrow down these steps for your exact situation, let me know: What is your (e.g., LE2115)? Which Android version (12 or 13) are you currently running?
Your phone will take longer than usual to boot up for the first time. Once it boots into Android 11, you will see the classic OxygenOS setup wizard. Back up everything to a cloud service or
Why users consider downgrading
It retains the distinct OxygenOS identity before the heavy integration with OPPO's ColorOS. Reliable Features: Fixed bugs related to Android Auto
The results were a minefield. XDA Developers threads. YouTube videos with titles like "DON'T TRY THIS AT HOME" and "BRICK FIX TUTORIAL." Warnings everywhere: This will wipe your data. This will void your warranty. You might end up with a paperweight.
Note: The screen may look like it’s stuck on the boot logo for up to 10 minutes. This is normal.