: Newer versions of ColorOS can sometimes cause lag or faster battery drain on the Snapdragon 665 processor found in this model. Compatibility

While there is no single "official" rollback package released exclusively for the public to download and install on their own, you can typically downgrade your OPPO A9 2020 through official channels like a service center OPPO A9 2020 originally launched with ColorOS 6 (Android 9) and eventually reached ColorOS 11.1 (Android 11)

. Due to its age, hardware performance can sometimes struggle with newer updates, leading users to seek a "rollback" to a more stable version like Android 10. Official Methods for Rollback Authorized Service Centers