MacBook Air A1466 firmware for the 820-3437-B logic board, packed as a ZIP of about 4.4 MB. The name gives no year, CPU or memory size, so compare the archive contents with your machine and confirm the board revision letter on the PCB. Apple's 820 numbers identify logic boards directly. The image is meant for the EFI SPI flash and can be written with an external programmer to recover a non-booting board. Keep a backup of the original chip, as it holds serial and hardware identity data.
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 (5)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 5 May 2018 | Open file on RM Schematics |
| @pepeelectronica | 26 Apr 2022 | Open file on RM Schematics |
| @generalbios | 8 Oct 2023 | Open file on RM Schematics |
| @schematics_bios | 25 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 2 Aug 2026 | 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 →