Boot ROM dump for an Apple logic board with part number 820-2101, revision A. The 820-xxxx format is Apple's own numbering for logic boards, and the suffix letter marks the revision, so check both against the board before flashing. The 2 MB image corresponds to a 16 Mbit SPI flash. Write it with a programmer when a Mac fails to chime or boot because of corrupted firmware. Note that serial number and system data stored in the ROM may belong to the donor machine.
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 @bios_laptop. 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 →