Mfit 21 utility package, 17.4 MB zip, likely the Intel Flash Image Tool for ME 21 platforms based on the name, with no exact build stated. Repair technicians load a full flash dump into it to check the region layout, swap or clean the Management Engine region and rebuild an image for writing with an SPI programmer. A tool built for a different ME generation can produce a bad image, so check the ME version in the dump first, and save the original chip contents before changing anything.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @sbiosworldchannel. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →