Thanks for sharing the update.
For Oppo A57, FRP and lock issues usually depend on the Android version and security patch level, so methods can vary a lot. It’s always important to make sure any solution follows proper device ownership verification steps to avoid issues later.
In general, using official recovery methods or service center support is the safest approach when dealing with account locks.
I also follow different tech-related topics and digital tools while working on web projects here:
Would be good to know which
Android version this case was on for better understanding.