For Qualcomm models, you typically need to put the phone into EDL (Emergency Download) Mode by holding Volume Up + Volume Down while connecting to a PC.
Without the correct Firehose file for the Oppo A57, your PC cannot send firmware (stock ROM) to the phone. With it, you can bypass the corrupted software and force a full flash. oppo a57 firehose file
: Bypassing FRP (Factory Reset Protection) or forgotten patterns when traditional factory reset methods fail. For Qualcomm models, you typically need to put