Github: Mmtool

There is no official AMI repository for MMTool. Instead, multiple unofficial GitHub repos exist, typically containing:

Beyond the GUI, developers host Python, PowerShell, and Rust scripts that automate BIOS module extraction using MMTool’s command-line interface (CLI). These repos are invaluable for batch-processing firmware updates.

If you need similar functionality without proprietary tools:

Searching for "mmtool github" is the first step into the world of UEFI reverse engineering. If you own an older PC (pre-2018) and need to add NVMe support or customize your boot experience, MMTool is an invaluable, free tool provided you acquire it from a trustworthy GitHub repository. mmtool github

However, for modern systems with Secure Boot and BIOS Guard, MMTool is largely obsolete. In those cases, you are better off sticking to official factory BIOS updates.

Final Checklist before using MMTool:

If you answered "Yes" to all four, you are ready to mod. If not, close MMTool and walk away—your stable PC is worth more than a custom boot logo. There is no official AMI repository for MMTool

Disclaimer: Modifying your BIOS voids warranties and carries inherent risks. The author and GitHub repository owners are not responsible for damaged hardware. Always verify your motherboard model and BIOS revision before proceeding.

If you are building a pipeline to mod BIOS files automatically, the GUI won't cut it. You need the command line version.

Using UEFIExtract (from the UEFITool GitHub): If you answered "Yes" to all four, you are ready to mod

# Extract all volumes from a BIOS
UEFIExtract bios.bin all
While "BIOS modding" sounds intimidating, there are safe, practical reasons to use MMTool.
Let’s walk through a classic mod: Adding NVMe boot support to a Z97 motherboard BIOS.