The internal storage layout of Android requires precise placement for the local update tool to detect the downgrade package.

The downgrade process , erasing all internal storage, photos, contacts, and apps. Go to Settings > System > Back up and reset .

Have you updated your OnePlus 9 to Android 12 and instantly regretted it? You are not alone. When OnePlus rolled out its Android 12-based OxygenOS 12 update, many users experienced significant issues ranging from battery drain to broken core features. The good news is that you can still downgrade your OnePlus 9 to the much more stable Android 11 via both official and community-developed methods. In this comprehensive guide, I will walk you through every method available for taking your OnePlus 9 back to the beloved OxygenOS 11 experience.

OnePlus provides official rollback packages packaged as .zip archive files. You must download the correct version corresponding to your specific OnePlus 9 model variant.

Select mode from the phone's notification shade.

: Download the stable Android 11 zip for your region from the OnePlus Community forums .

Try editing the payload_properties.txt file inside the update ZIP and change oplus_update_engine_verify_disable to 1 . However, note that “this could still result into bricking your phone because of this unintended update path”.

on your device, so ensure you have a complete backup before starting. Prerequisites Rollback Firmware

The OnePlus 9 is a powerful device, but software updates do not always suit everyone. If you upgraded your phone to OxygenOS 12 or OxygenOS 13 and found that you dislike the interface, experience battery drain, or miss the classic OxygenOS features, you can go back.

Tap the located in the top right corner. Tap Local Upgrade . Select the Android 11 rollback package from the list. Tap Install Now and confirm the data wipe warning.

: Look for the official OxygenOS 11 rollback zip for LE2115 or LE2113.