EFI firmware dump for an Apple logic board numbered 820-00244, stored as a raw 8.00 MB .bin image. The name gives no revision, EMC number or status, so treat it as an untested reference image. Technicians flash such files onto the board's SPI flash with a hardware programmer when the Mac fails to boot because of corrupted firmware or a locked chip. Compare the 820 number printed on the PCB, back up the existing chip, and check the flash part is 8 MB before writing anything.
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 →