OPPO officially recommends visiting an for downgrades. This is the only way to ensure the software is genuine and that your warranty (if any remains) is not voided. Pro: Safe, official, and no risk of "bricking" the phone. Con: May involve a service fee or travel time. Method 2: Manual Flash (Advanced Users)
The reached its official end-of-life for software support after updating to ColorOS 11.1 (Android 11) . For many users, this final update caused lag, leading to a high demand for "rollback" or "downgrade" packages to return to the more stable Android 10 or Android 9 . Why Use a Rollback Package? oppo a9 2020 rollback package exclusive
Newer OS versions can sometimes be too heavy for the Snapdragon 665 processor . OPPO officially recommends visiting an for downgrades
Older versions often offer better optimization for aging batteries. Con: May involve a service fee or travel time