The tool should automatically detect the .ofp file if it's in the same folder. Connect Device: Power off your Hold Volume Up + Volume Down simultaneously. Connect the phone to your PC via USB cable.
This is a bootloader verification error. Boot into Recovery, select "Format Data," then reboot. If it persists, re-flash the firmware and check "Flash all partitions" including vbmeta.img . oppo a53 firmware flash file
OPPO does not publicly release official firmware files (like Xiaomi or Samsung). Most flash files online are custom-made backups from service centers. Proceed with caution. The tool should automatically detect the
and the XML files (rawprogram and patch) from the extracted firmware folder. Start Flashing : Click the button. A progress bar will appear. Do disconnect the cable until it finishes. select "Format Data