Firmware archive for the Apple Mac mini 2012, model A1465 with EMC 2558, logic board 820-3227, containing an 8 MB boot ROM image. Apple uses 820- numbers for its logic boards, so the code on the PCB must match exactly. Technicians flash such a dump to the SPI ROM to fix no-boot faults or firmware locks; dump the original chip first, since it holds the serial number and other machine-specific data that may need transferring.
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 →