No…after inserted the NVMe dxe driver, the mod rom is to replace the previous bios region you extracted with the UEFItool, again on the CAP file, then the file is renamed and USB BFB will work.
EDIT: Where did i mentioned MMtool for the bios region swapping operation on the CAP???.. i said UEFI tool, MMtool is only for the insertion of NVMe DXE
EXTRACTION from the AMI CAPSULE:
REPLACE with the mod file already with NVMe inserted:
Saving will now ask to rebuild and view the new file.
EDIT: “Within the CAP file, so the newly created file, is presumably the file to rename and then flash to the bios…”
Yes, now rename the CAP according Asus BFB and use it with it, thats it if the NVMe was correctly inserted upon the guide, follow the OS nstallation instructed also in the guide.