Hi Guys, I know this is old, but my buddy gave me his MBP 2015 13" , he said its locked ( bricked ) after he tried to install Big Sur when it 1st came out. I know that Apple updated it to 11.1 .. IS there any known fix to get it back working again to get 11.1 on this locked up machine? TIA ... for any replies. Some articles say SMC reset needs to be done some people say it needs a new logic board.