The modified BIOS may remove legacy/CSM support, requiring a pure UEFI boot environment.
Access the “pro” features by pressing in the main BIOS screen, or by enabling “OEM Mode” under Save & Exit. This reveals: machinist x99 mr9a pro bios exclusive
An excellent example of community work is the repository by user 0x8008 . It provides several pre-modified BIOSes designed for the MR9A: The modified BIOS may remove legacy/CSM support, requiring