Connect your Oppo A57 in EDL mode. The tool should show "Qualcomm HS-USB QDLoader 9008" at the top.
drivers so Windows can properly map the phone's COM port interface.
While holding the buttons, connect the phone to your computer using the USB cable.
Click on Browse next to the Programmer Path and select your extracted OPPO A57 Firehose .mbn file.
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The protocol timed out, or a mismatched programmer file was loaded.
What is the phone showing? (Bootloop, dead screen, or screen lock?) Which flashing software do you have installed on your PC?
Re-flashing stock partitions when the phone hangs continuously on the OPPO animation.