Firmware for the Apple MacBook A1347, which is the Mac mini, on logic board 820-2577 at revision A. The 820-xxxx part number is Apple's own logic-board numbering, and the board in hand must carry the same number. The 2.66 MB ZIP holds an EFI image for writing to the SPI boot ROM with a programmer when a machine has a corrupted firmware. Dump the original chip first, since it holds serial and configuration data, and check that the image size matches the ROM.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →