--- Mmtool Aptio 4.50.0023 -

  • After flash, perform CMOS clear and a full power cycle.
    • mmtool.exe <BIOS.rom> /replace <module_guid> /file <new.efi> /out <modified.rom>

    Or via GUI:

    Many users dislike the flashing "Gigabyte" or "ASUS" logo. With MMTool:

    (Note: MMTool menus differ slightly by build; below are typical workflows.)

    A) Extract module

    B) Replace module

    C) Insert module

    D) Delete module

    E) Patch GUID/Attributes

  • Safety

    • Mmtool Aptio is a software tool designed for managing and updating firmware components, particularly in the context of UEFI (Unified Extensible Firmware Interface) systems. Aptio is a series of firmware tools developed by AMI (American Megatrends Inc.), a leading BIOS and UEFI firmware provider. --- Mmtool Aptio 4.50.0023

    Not all drivers are independent. An NVMe driver might depend on UefiPciBase, PartitionDxe, or SmmAccess. If those are missing, your system will hang indefinitely during POST. Research your specific board's module dependencies before inserting.

    Mmtool (AMI Firmware Update Utility) is a proprietary tool from AMI (American Megatrends International). Version 4.50.0023 belongs to the Aptio series, designed for manipulating UEFI firmware volumes.