Aorus AX370-GAMING 5 | POSTCODE 54

[russianretard]

Hi everyone.

My PC specs:
CPU - Ryzen 1600x, 
CPU cooler - NZXT Kraken X62
Motherboard - Aorus AX370-GAMING 5
GPU - GTX 1060
Old ram - Gskills Trident Z 3200mhz(16gb) / New ram - Corsair Vengeance RGB 3000mhz(16 gb)
Other prob doesnt matter.

Sry for my retarded english btw.

So, about 5 month ago i got my new pc, and all was fine for 1 month. 
One day after that month i tried to check overclock settings for, and watch XMP profiles, but after i did it i got bios freeze, and i cant do nothing. Also after reboot i got the same thing. Like, u can access to bios, but u cant change anything.
I just booted in windows and all was ok except the BIOS. I rebooted again, and got a 54 postcode without ability to access to BIOS/Windows. Just black screen and thats all.

I contacted gigabyte support and they answered what its a RAM problem, and i need to RMA it.
Ok, i did it, and because im living in Russia i waited 2 month(s/o to russian post) for rma and then bought new ram. But its not working too, and i have same postcode.
Both ram is in support list of this motherboard, and i have friend with same motherboard+ram.
I tried to use other bios, (i have switches on my motherboard for it, but its not helped me). 
So now im trying to fix my problem - and have no idea how to do this.
Also i can get 53 postcode, but its change to 54 in some seconds.
Videos:
Got 53 then 54 here - 
https://youtu.be/5hPKro5RHZk
Thank you in advance.