It is always recommended to have the most recent firmware version on the OPPO A53, which is C.22. To enrol into Oppo A53’s ColorOS 12 Beta (Android 12) program ; simply go to Settings, Software Update, and request beta updates from within there. Within three working days of being chosen, you will receive the update via OTA.

The first batch of beta registrations for the device is now open until April 19.  Since OPPO has issued stable builds approximately a month after beta launch, the device will most likely get ColorOS 12 stable by the end of April 2022 or early May 2022. Via

ColorOS 12 Beta  Android 12  For OPPO A53 has been released - 54