"My Function keys are messed up. Volume & Brightness keys don't work!"に関する回答If unchecking Function keys nor SMC and PRAM reset don't work, it can be a Key-remapping issue related with a hardware security mechanism against malware (as explained in the last post in https://discussions.apple.com/thread/654...). Apple uses in store a non-accesible software tool. For me, the solution was just installing and opening this program: https://github.com/tekezo/Karabiner-Elements. Solution taken from https://apple.stackexchange.com/question...-row-of-keyboard-isnt-working.