Firmware dump for Apple logic board 820-3476, also noted as 3536, revision A, with the Management Engine region cleaned, in an 8.00 MB .bin file. The Russian word in the name means clean, referring to the ME section. A cleaned ME avoids issues carried over from a donor, such as fan or boot problems. Flash it to the SPI chip with a programmer after backing up the original, confirm which of the listed board numbers your PCB carries, and check the chip is 8 MB.
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 →