Firmware image for Apple logic board 820-00928, revision A, delivered as a BIN in a 5.11 MB ZIP. On Mac boards this is the EFI/BIOS dump stored on the SPI flash, used to recover a board that will not boot or is locked by a corrupted firmware. Write it with an external programmer after reading and saving the original chip, since the original holds serial and configuration data. Confirm the board number on the PCB and that the image size matches the flash capacity.
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 @biosarchive. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →