RAR archive with firmware for the Apple Mac mini 2012, logic board 820-3227, prepared as an 8 MB image with the Management Engine region cleared. Apple numbers its logic boards with the 820 prefix, and the 8 MB size points to a 64 Mbit SPI flash chip. Extract the image and write it with an SPI programmer after reading and saving the original chip, which holds machine-specific data such as the serial number. Confirm the 820 number on the board first.
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 →