EFI firmware for the Apple MacBook Pro A1260, internal code M87, logic board 820-2249, in a 1.26 MB 7z archive. Note that another common board number for this model is 820-2249 variants, so the revision letter on your PCB should be checked, since the name gives none. A dump like this is programmed into the SPI boot ROM using a hardware programmer and clip. Save a full read of the original chip before erasing, and make sure the image size equals the chip capacity before writing.
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 .7z file
High-ratio compressed archive, often used for large BIOS collections.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →