Apple firmware archive labelled only with the model number A1342, the polycarbonate MacBook, with no logic board number or revision given. The 7z file is 1.61 MB. Because the name is minimal, confirm the 820- number on the board before using the image. Such dumps are programmed into the SPI boot ROM with an external programmer to recover a machine with corrupted EFI. Back up the original chip first and check that the image size matches the flash capacity.
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 →