EFI firmware image for Apple logic board 820-00923, provided as an 8.00 MB .bin file. The name gives only the board number, without revision, EMC or working status. Use it with an SPI programmer to restore the firmware chip on a board that powers up but fails to boot. Check the 820 number and revision printed on the PCB, back up the existing chip before erasing, and confirm the flash capacity is 8 MB so the image writes completely.
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 →