A57s ^new^ - Firmware Oppo

Go to Settings > About Device > Official Versions (or System Updates ).

If you can provide the (e.g., CPH2385...A.30) that is currently installed, I can give you a more specific guide. Also, are you trying to update the phone or unbrick it? OPPO A57S CPH2385 - GSM HOSTING FILES Firmware OPPO A57s

The device supports OTA (Over-The-Air) updates, allowing users to update their software through the settings menu. Go to Settings > About Device > Official