That motherboard appears to require a CPU to be flashed. However it can flash directly via the internet:
https://www.asus.com/us/support/FAQ/1012815/
If you don't already have this board, you can contact the seller and ask them to check the box for the BIOS revision (it is often printed or added as a sticker to the box). You can send motherboards to service centers (ASUS has many globally) and they can also flash it for you.
Some times the system will at least POST with a unsupported CPU, and you can still flash it for maximum compatibility at that point.