Boot ROM image for an Apple A1260, the M87 MacBook Pro, on logic board 820-2294-A. Packed in a 1.27 MB RAR archive. M87 is Apple's internal project code for this model. Technicians write such a file to the SPI flash with an external programmer when the machine powers on without chime or video due to bad firmware. Verify the 820- number and revision letter on the PCB before relying on it, and read and archive the original chip contents first so the serial and settings can be restored.
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 @biosfiles. 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 →