Anyone who tries these bioses are beta testers, despite the announcement Gigabyte made in october stating that all z170 would support kaby lakes, they still dont, not without serious issues.
So i advise people to not try, do not waste your time working as beta testers for gigabyte.
I wish they gave half the support Intel gives on their forum, whats the point of having several localized forums and not giving proper support in any of them. User support in such matters, without any official support whatsoever is useless.
Not only that, ive found that mine GA-Z170N-WIFI throttles heavily with i7's without any overclock, a design flaw that gigabyte says nothing and has done nothing about it. I wanted to update my bios aswell to get a 7700k, now ill just have to sell the board for cheap because of its design flaw, and buy a new one from another brand to achieve what this board was supposed to achieve in the first place.
Failure all around.