Because performing a rollback typically , it is essential to back up your device before proceeding. How to Use the Rollback Package

: Official downgrading requires proprietary tools like the OPPO System Upgrade Tool or specific service-center-only software. Seeking a "Rollback Package"

A rollback package, also known as a downgrade package, is a software package that allows users to revert to a previous version of their device's operating system. In the case of the Oppo A9 2020, the rollback package would enable users to downgrade from a newer version of ColorOS to an earlier one.

: A critical aspect of using a rollback package is that it wipes all user data ; a full manual backup is required before starting. Rollback Process Overview