Writing to help anyone facing this issue



I had issue where suddenly FN key stopped working and I wasn't able to use all FN functionalities on blackwidow v3 mini hyperspeed. After checking BIOS, reinstalling device drivers or checking for any custom profiles/bindings on the keyboard, none of them worked.

Found that FN key stops working when Razer Synapse starts. Anytime I kill the Razer Synapse app, the FN key starts working properly.



Solution: Completely reinstalling Razer Synapse and other Razer software's fixed the issue for me