The primary tool referred to as on GitHub is an official utility from American Megatrends Inc. (AMI) used for modifying Aptio EFI ROMs
Automation Scripts: Many developers host scripts (often in Python or Batch) that utilize MMTool in the background to automate complex BIOS mods, such as the "CoffeeTime" or "UBU" (UEFI BIOS Updater) projects. mmtool github
UEFI drivers are almost universally compressed (usually using Tiano or LZMA algorithms). When you look at a module in MMTool, you are often looking at a compressed blob. The primary tool referred to as on GitHub
Modifying a BIOS manually can be risky. GitHub developers have created Python and Bash scripts that use MMTool as a backend to automate complex tasks. Instead of clicking through a UI, you can run a script that identifies the correct module and replaces it with 100% accuracy. 2. The UBU (UEFI BIOS Updater) Project inserting SLIC tables
: Some users host Python or PowerShell scripts that call MMTool via the command line to batch-process firmware files. Documentation & Guides
If you need similar functionality without proprietary tools:
The tool is not officially open-source, but various versions (including patched or reverse-engineered builds) have been uploaded to GitHub by third-party users for archival, educational, or utility purposes. It is widely used in firmware modding communities (e.g., BIOS-mods, Win-Raid) for tasks like adding NVMe support, inserting SLIC tables, or updating CPU microcode.