Firmware dump for an Apple A1370 MacBook Air with logic board 820-2855, revision A, taken from a Macronix MX25L6406D flash chip, which is a 64 Mbit (8 MB) SPI part. Apple uses the 820-xxxx pattern for its logic board numbers, and the full number with revision is printed on the PCB. Technicians write such an image with an SPI programmer to recover a board that will not boot or has corrupted firmware. Back up the original chip first, since serial and other machine-specific data stored in it may need to be preserved.
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 →