[domelec]

Well from what iv read and understood he is saying the fake mcu can be reflashed.
he had the software to do this but lost it
my question to shooting is this:
do you still have the hex file you used to use to flash? if yes then this would be a start
post it here
also try to remember what the flasher software you used was called, someone might then remember it and have it.
without name or hex/bin noone can help and only other way is to replace the mcu.

also what matty is saying to you is he has never seen anyone able to do what you are saying you used to do. (reprogram fake mcu)