Question about ASUS ROG STRIX Z790-A Gaming WIFI

Update to Bios 1501, incl. new Intel ME version. Download on Asus support page

No, it has to be updated, but it was easy for me in 3 minutes. Unfortunately, I can't say whether it worked because the MB seems to be defective (I built a new PC at the weekend).

Yes, but not directly, it has to be installed via usb before use.