Warning Some of beta BIOSes are still undergoing compatibility testing. GIGABYTE is sharing these BIOSes for testing purposes only and are not meant for general release. If you are not familiar with beta BIOS testing, then please only flash the recommended release BIOSes that are posted on the...
www.tweaktownforum.com
@pastrychef shared this link with me on another
THREAD, the beta BIOS for the Z390M Gaming reinstates the disable Serial Port option. It's stable for me and solves the Apple Watch Unlock problem. I don't know if the Gaming X BIOS reintroduces this functionality and obviously flash BIOS at own risk (use qflash NOT @BIOS)