Firmware binary for the Apple A1932 MacBook Air on logic board 820-01521, from chip location U2890, compressed in a 596 KB ZIP. Apple uses 820-xxxxx numbers to identify logic boards, and this location is a small flash chip rather than the main EFI ROM. Technicians program such a dump after replacing a damaged chip or when firmware corruption prevents boot. Save the original contents first, confirm the chip type and capacity, and verify the board number matches before writing with a programmer.
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 @biosarchive. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →