Raw 8 MB EFI firmware image for the Apple logic board 820-00165-A, EMC 3178, dated 2017 in the name and reported as tested and working. Apple uses the 820-xxxxx pattern for its own board part numbers, so the code printed near the board edge is the reliable way to match this file. The image suits a 64 Mbit SPI chip and is written with a programmer such as a CH341A or similar. Always dump the existing chip before flashing, because it holds machine-specific data that a donor image will not carry over.
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 @ITHINKHS. 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 →