326zip: Mmtool

Right-click mmtool_326.zip and select "Extract All." A typical extraction yields:

After modification, MMTool automatically recalculates and fixes the BIOS image's checksums, ensuring the modified ROM is flashable. mmtool 326zip

This is not a tool for the faint of heart. Right-click mmtool_326

If you cannot find a working copy of mmtool 326zip or your BIOS is too new, consider these alternatives: This is not a tool for the faint of heart

For most users born after 2015, UEFITool combined with a hex editor is a safer, more powerful option.

If you already have this file:

MMTool displays the BIOS as a tree of modules (each with a GUID, name, size, and type). You can right-click any module to extract its raw binary (.bin or .rom) or replace it with a modified version.