refers to a specific version of the AMI MMTool (AMI Module Management Tool) , specifically version 3.26 , usually distributed in a .zip archive.
According to community guides on forums like Win-Raid , the typical workflow for version 3.26 involves: mmtool 326zip
MMTool 326zip sometimes fails to calculate accurate checksums for certain UEFI 2.6+ images. Fix: Use Intel Checksum Correction Tool or re-open the image in UEFITool and manually fix the checksum. Mmtool 326zip refers to a specific version of