EFI firmware dump for the Apple MacBook Pro A1398 with logic board 820-3662-A, stored as a RAR archive of about 14 MB. Technicians reprogram the SPI ROM with such an image when a board powers on without chime or video, or after a firmware lock or corruption. Read and keep the original chip contents first, since they carry the board serial and system data that may need to be transplanted into a clean image. Check that the image size matches the flash chip and that the 820-3662 number on your logic board is the same.
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 →