Reply I got from support:
We are aware of this issue for the X9SC_ series boards.
These boards had been end of life since 2015.
We are working on a fix right now and should have new BIOS posted in our website in a couple of weeks.
If you need to access BIOS setup then you can reset CMOS or change the system date in OS to a time before 1/2021, then access BIOS.