Most of the repair shops do at most a flash of a firmware image of a similar machine / board or do nothing at all. Some refuse completely to work in this area and sell new parts.
The information you got about ME / bios region / firmware functions is at least incomplete if not wrong, but it might have gone through some filters (your parents, your limited knowledge…)
Read the forum, there’s some guides about ME- function, updating updating and reconfiguring. Otherwise there’s quite a lot of information via search engines.
Haven’t seen many destroyed cpus and boards directly after flashing ‘something’.
But unclear what you did and unclear what happened.
Do you still have the image you flashed and the backup / dump of the original firmware you hopefully did before flashing something? Attach or post those images. What machine / board are we talking about?