Apple A1181 MacBook firmware for the M42C project, marked as working in the name. No logic board number is included, so check the 820- number on your board before use. Supplied as a 1.13 MB 7z archive. Images of this kind are flashed to the SPI boot ROM with an external programmer to fix no-chime or no-video faults caused by corrupted EFI. Read and store the original chip first, and compare the image size with the chip capacity so it fits correctly.
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 →