I just updated my z270x Intel (Gigabyte) Motherboard. I upped the BIOS from F6 to F7, fixing a hyperthreading fault. Afterwards, my wifi chip didn't work.
There has been some discussion on the Arch Linux Forum that claims you have to turn off the PC completely for a sufficient amount of time so the card can completely shut off and reconfigure itself for the new BIOS.
That doesn't work for me however (5min wait without power cord attached and pushing power button a few times)
Odd is, the bluetooth (which is on the same adapter) works.