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ASUS Z170 PRO GAMING bios problems.

Level 7

I just bought a new system having following specs:

CPU: Intel Core I7-7700k
Motherboard: Asus Z170 Pro gaming
GPU: Asus GTX 1060 STRIX OC 6gb
Cooler: Riing Silent 12
PSU: Super Flower Leadex Silver, 750W, Modular, 80+ Silver, PFC Active
RAM: HyperX FURY Black 16GB, DDR4, 2400MHz, CL15, 1.2V, kit 2x8GB

So in order to get 7700k to work with z170 i had to update bios to version 3016. I updated but the problem is that i can't stay in BIOS. After 5 seconds in BIOS the PC goes crazy, screen starts to flicker(it opens, then in reopens) constantly, it's like it's always on "failsafe". And then in windows on idle checking the temperatures of CPU shows arround 27-30C, but from time to time, CPU temps, or random core, jumps from 30C to arround 50C and instantly goes back to 30C. Ex: Core"x" 28C(second 1) -Core"x" 50C(second 2)-Core"x"28C(second 3), and then stays at 28C but after a while(1min, 30seconds it depends) it happens again. Also when gaming(for example BattlefieldOne or Red Orchestra 2) the CPU temps oscilates very crazy like now is 47C, then 71C, then 55C, then 60, then goes back arround 48C and so on(in my opinion this happens too fast like jumping from 45C to 70C and then go back in just a second it is not natural). And as soon as i close the game temperatures drops to 34C in less than a second(again its too fast too cool/heat so fast). I tryed bios version 3202 too and the problem is still there. Is there anything i can do besides returning the MOBO and get another one ?