BoringBoredom/UEFI-Editor: Aptio V UEFI Editor (github.com)
EDIT: AMIBCP its only valid for showing the content on AMI V bioses, not editing as it was on AMI IV bioses. The link present is a modern alternative to permanent mods like AMIBCP was doing in AMI IV.
All mods should be done out of the CAP file (UEFI tool) or only in extracted bios_region with FPT tool, do not and no need to work on the full bios file.
Mod file can be flashed after correctly stitched, with USB BFB feature.
As this is not an 50€ board, perform the correct backups.
Further questions and doubts post it on the related thread:
[TOOL] UEFI Editor - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)
A guide not by the tool owner: [GUIDE] Usage of AMI’s AptioV UEFI Editor + FPT Flash Method - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)