Firmware Oppo A57s ((link))

: Usually ranges from Android 12 (initial release) to Android 13/14 via updates. How to Update Your Firmware

The is a popular mid-range device known for its large display and reliable battery life. To keep the device running smoothly, OPPO releases periodic firmware updates. These updates are essential for the longevity and security of your phone. Firmware OPPO A57s

If manually installing a local .zip firmware file, copy the file directly to your phone's external SD card root folder. Turn off the device completely. : Usually ranges from Android 12 (initial release)

Do you already have a on your computer?