Oppo A57 CPH2407 Stock ROM Firmware is now available for download and You can download it below. by using this firmware you can solve all software Issues within your Oppo A57 CPH2407such as hang-on Logo, FRP lock, fastboot Mode, display blank or white after flash, dead recovery, dead after flash, etc.
On this page, you will find the direct link to get the official Oppo A57 CPH2407 Stock ROM Firmware (flash file) on your computer. The Firmware comes as a zip package and contains the original Firmware, Flash Tool, Driver, and How-to Flash Manual.
make a backup before the Process
it will erase all your data Including Internal Storage