Hello @Greenapp ,
Z97-a 3.1 may work if we can get Above 4GB decode to work.
-EDIT: Just looked into the latest BIOS file and there is an Above 4GB option in the “Boot” menu of the setup. \o/
Flashing a modified bios may require the use of a different flash utility.
Check the Asus section on this page for help with flashing.