BIOS firmware image for an Apple logic board numbered 820-00431, supplied as an 8 MB raw binary with the Management Engine region already cleaned. A cleaned ME region lets the board initialise without inheriting stale ME data from a donor machine. Technicians write it to the SPI flash chip with a hardware programmer when the original firmware is corrupted. Confirm the 820 number printed on the logic board, back up the existing chip contents first, and check that the flash capacity matches the 8 MB image.
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 →