EFI firmware image, 8 MB, for Apple logic board 820-3115, revision B, and marked 100% ok as a tested working dump. The name does not give the Mac model, so confirm the full 820- number and revision on your logic board before flashing. The 8 MB size suits a 64 Mbit SPI chip. Read and keep the original chip contents first, as it holds the serial number and system identity, then write with an external programmer and verify the result after writing.
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 @cidschematicandboardviewofficial. 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 →