Working firmware dump for the Apple logic board 820-2901, a MacBook board number in Apple's 820 series. The name gives no revision or model year, so confirm the 820 number printed on the logic board. Technicians reflash the SPI BIOS chip with this image to recover a board that will not chime or boot. Read and save the original first, because the Mac's serial and hardware data live in the chip. The file must match the flash size.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →