If unchecking Function keys nor SMC and PRAM reset don't work, it can be a Key-remaping issue (as told in https://discussions.apple.com/thread/6545759). A solution is just installing and opening this program: https://github.com/tekezo/Karabiner-Elements
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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/6545759). 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/questions/166294/top-row-of-keyboard-isnt-working.
If unchecking Function keys nor SMC and PRAM reset don't work, it can be a Key-remaping issue (as told in https://discussions.apple.com/thread/6545759). A solution is just installing and opening this program: https://github.com/tekezo/Karabiner-Elements
Solution taken from https://apple.stackexchange.com/questions/166294/top-row-of-keyboard-isnt-working.