BIOS dump for the Apple A1261 MacBook Pro on logic board 820-2262-A, in a 1.27 MB 7z archive. Apple prints the 820- part number and revision letter on the logic board, and both should match before flashing. A technician writes this image to the SPI boot ROM with a programmer when EFI corruption prevents startup. Save a full read of the original chip before erasing it, since it holds serial and configuration data, and verify the write afterwards.
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 →