Firmware image for an Apple logic board 820-3476, revision A, with the EMC number 2678 included in the name and an outimage label suggesting a processed or prepared output dump. The file is 8.00 MB, matching a 64 Mbit SPI flash. Apple 820-xxxx numbers identify the logic board itself, so match it to the PCB silkscreen. Technicians write such images with a programmer like a CH341A or RT809 to recover a board with corrupt firmware; always read and save the original chip contents before erasing and flashing.
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 →