Working firmware dump for Apple MacBook Pro A1286, logic board 820-3330 revision B, in an 8.00 MB .bin file. The work tag indicates it came from a functioning machine. Technicians use this image to reflash the SPI chip storing the EFI firmware when a board powers on but does not chime or boot. Read and archive the original chip, check the board number and revision printed on the PCB, and confirm the chip is 8 MB so the image fits without truncation.
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 →