Downgrade Oneplus 9 To Android 11 Exclusive [2021]

Step-by-step: Downgrade OnePlus 9 to Android 11 (OxygenOS) — short guide

Warning: This will wipe your device, void warranty, and can brick your phone. Proceed only if you accept the risks.

Conclusion

Why Downgrade? The Android 12 & 13 Blues

Before we dive into the how, let’s validate the why. You aren’t alone. Community forums are flooded with complaints: downgrade oneplus 9 to android 11 exclusive

Delete each (critical for space)

fastboot delete-logical-partition system_a fastboot delete-logical-partition system_b fastboot delete-logical-partition product_a fastboot delete-logical-partition product_b fastboot delete-logical-partition vendor_a fastboot delete-logical-partition vendor_b Step-by-step: Downgrade OnePlus 9 to Android 11 (OxygenOS)

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: Local Update APK: Since OxygenOS 12 and 13

To downgrade your Go to product viewer dialog for this item.

Many OnePlus 9 users found that the transition from OxygenOS 11 to OxygenOS 12 (and later versions) significantly altered the software experience, introducing a design language more akin to OPPO's ColorOS. If you miss the clean, stock-like feel of the original Android 11 builds, you aren't alone.