--- Mmtool Aptio 4.50.0023

That said, Mmtool is not magic. It is a chainsaw, not a scalpel. Respect the tool, understand your BIOS layout, always have a hardware programmer on hand for recovery, and never flash a modified BIOS on a mission-critical machine without testing.

The tool will recompress the volume. You should now see NvmExpressDxe in the module list. If you see an error like "insufficient space", you may need to delete an unused module first (e.g., a legacy 32-bit option ROM). --- Mmtool Aptio 4.50.0023

Click File → Load Image . Select your motherboard’s original .ROM or .CAP file. For Intel 100-series and newer, you may need to use the "Load Image" as-is; for older, ensure the correct file extension. That said, Mmtool is not magic

Choose the NvmExpressDxe.efi module (or Nvme.ffs ). Ensure the driver is from a similar platform (e.g., use an Z370 driver for Z170). The tool will recompress the volume