Firmware dump for the Apple Mac mini A1347 on logic board 820-3017-A, described as a working, fully tested BIOS, with a TB tag in the name that is not further explained. The 820 prefix is Apple's own logic board numbering, followed by a revision letter. Technicians use this kind of image to rewrite the EFI SPI flash when the machine shows no chime or boot loops due to corrupted firmware. Verify the board number on the PCB and save the original chip before programming, since it contains machine-specific data.
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 →