CSME System Tools for Intel ME version 13.50, revision r3, in an 18.5 MB RAR archive. The 13.50 branch differs from 13.0 and 13.30, so match it carefully to the version found in the board's original firmware. The toolkit typically includes the Flash Image Tool, Flash Programming Tool and MEInfo for analysing and rebuilding the ME region. Technicians use it to prepare a clean, working SPI image; keep a backup of the original dump before programming.
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 @mfittool. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →