Apple firmware image for logic board 820-3437 marked 2013, stored as an 8.00 MB raw binary. No revision, EMC number or status is given beyond the year. The file is meant for reprogramming the SPI flash chip that holds the EFI firmware, using a hardware programmer when the board does not boot. Compare the board number on the PCB, read and save the existing chip contents, and verify the flash capacity matches the 8 MB image before writing it.
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 @efibios. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →