About Asrock X370 Killer SLI/AC

And did you try crashless bios after then.

Looks like you get the update (get 1.6 off the site) extract it make sure a flash drive is formatted in FAT. Copy it to the flash with nothing else on the flash drive

And plug it into a USB 2 port

See what happens. If that doesnt work buy a replacement BIOS or RMA it