BIOS firmware for the Apple A1226 MacBook Pro, project M75, logic board 820-2101-A, from a unit with a Core 2 Duo T7700 at 2.4 GHz according to the name. The 7z package is 1.32 MB. A dump like this is written to the boot ROM with a hardware programmer to recover a board that fails to start. Confirm the board number and revision on the PCB, keep a backup of the original chip contents, and verify the image size matches the flash device before programming.
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 →