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Welcome to the forum.
X79 boards (You don’t specify any model) with AMI Aptio IV core bios, most of them still accepts changes made with AMBCP 4.xx.
Give it a reading on threads, by a forum search related to “Bifurcation”
Another tool as an alternative for AMIBCP 5.xx on more recent bios releases here:
[TOOL] UEFI Editor - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)
Usually, this alternative is used because modern bios files (depends on the vendor and release date/updated implementation), due to variables are spread across more modules than just the AMISETUP and “leaked” versions of the AMIBCP can no longer correctly dela with this change.
Good luck.