Hello there,
i want to ask you if is save to use bios F.21 i got in my Windows Update (i dont know how is it possible). It was named under update HP Inc. - Firmware and some numbers i dont remember and also i thought it is not a bios update. However newest bios i can get from hp drivers on hp site is F.19. So my question is can i use it normally without something get wrong? 
Update 1: I actually reroll back to F.18 BIOS, cause this bios have strange fan problem. Everytime a turn on laptop, there is like two seconds duration of full speed fans, which seems not looking good for me. But now i have now another problem. Everytime i restart windows, it automatically enter in bios utility to upgrade, but i dont want to go to F.21. Cant get rid off it, any solutions??