New build. BIOS cpu compability problem. How do i fix it?

[sisrace]

Hi. So im helping a freind to build his computer and after many hours of trubleshooting i know the problem,
The cpu that he got is an 7700K FM2+ cpu
But the motherboard only supports FM2+ Cpu's if you have the F2 BIOS version.
But the stock on the mobo is F1 and i cant update the bios becouse 1: i dont know really how to flash a bios via a usb stick, And 2: i cant see anything becouse nothing shows up on the monitor.
Also no mouse or keyboard light up or give any sign of life.
What do i do? On gigabytes website they say you need to have a FM2 cpu to update the bios so it becomes compatible with FM2+
Why gigabyte are you doing this?
i've heard you can use the BIOS without a cpu but apperantly gigabyte doesent support it. Only ASUS does that i dont know. Does he have to change out the cpu or change motherboard to one thats already compatible with FM2+ `?

 

[Mellon Head]

He will likely have to change to a CPU that is compatible with the motherboard, flash the BIOS, and then put the new 7700K into it.

Is it possible to borrow an FM2 CPU from somewhere? Something that is compatible with the motherboard? I keep a spare Phenom chip around just for that purpose. It's saved my butt twice with motherboards that don't ship with the right BIOS version.