EFI firmware dump for the Apple MacBook A1286, project M98, logic board 820-2330-A, sized for a 4 MB flash chip. Technicians use such an image to recover a board that powers on without booting, by writing it to the SPI chip with a programmer. Apple's 820 prefix marks logic board part numbers, and the suffix shows the revision. Read and keep a copy of the original chip before writing, and confirm that the chip really is 4 MB, because an image of the wrong size will not fit.
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 →