Firmware dump for an Apple machine identified as model A1347 on logic board 820-5509, revision A, with the ME region fixed. A1347 is the Mac mini, and Apple logic boards use the 820-xxxx numbering. A repaired Management Engine region can clear boot or fan problems caused by a corrupted ME. Flash it to the SPI ROM with a programmer, keep a copy of the original first, and confirm that the 820 number on the board matches.
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 @biosarchive. 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 →