Firmware package for a MacBook Air A1466 with logic board 820-3437-B, in a 4.41 MB ZIP. Apple uses the 820-xxxx pattern for its logic board numbers, with a trailing letter for revision, so matching the full code matters. Such a dump is used to rewrite the SPI EFI chip when a machine is stuck without chime or locked after repair. Read out the original contents first to preserve the serial and firmware data, and check that the image size equals the chip capacity before programming it.
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.
All sources (3)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 30 Dec 2020 | Open file on RM Schematics |
| @biositechyangiyer | 1 Feb 2021 | Open file on RM Schematics |
| @biosdumpcomputer | 26 May 2022 | Open file on RM Schematics |
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 →