Apple firmware dump for the MacBook Pro A1398 with logic board 820-3787-A, supplied as a 4.89 MB RAR. Apple identifies its logic boards with 820-xxxx numbers, and the suffix letter marks the board revision. Such an image is used to rewrite the EFI SPI flash when a machine shows no boot, a firmware lock or a corrupted ME region. Read and keep the original chip contents before programming, since they hold the serial number and other machine-specific data, and confirm the 820 number on the board.
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 →