EFI ROM archive for the Apple MacBook A1342 on logic board 820-2567, project code K84; the name also carries an MBP tag. The 2.12 MB RAR holds the boot firmware used to revive a board with corrupted or blank flash. Technicians dump the existing chip, keep it safe, and then write this image with an external SPI programmer. Confirm that your PCB is 820-2567 before flashing and check that the image size matches the capacity of the installed flash chip.
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 →