Assuming you have TWRP recovery:
Visit the official Oppo support forum or use SP Flash Tool (for PC) if the SD card method fails repeatedly. Good luck! flash oppo a57 via sd card work
Choose and locate the firmware .zip file you saved earlier. Confirm the installation when prompted. Wait and Reboot Assuming you have TWRP recovery: Visit the official
: Find the firmware file on your SD card and select it. Confirm the installation when prompted. flash oppo a57 via sd card work
Connect your SD card to a computer or another functional smartphone.
Before we insert an SD card, let’s define “flashing.” Flashing is the process of writing a new firmware (stock ROM) into the phone’s internal memory.