Cleaned EFI firmware dump for the MacBook Air A1466 on Apple logic board 820-3437-B, packed as a 9.22 MB ZIP. A clean image usually means unit-specific data, such as serial and lock settings, has been removed, so it suits boards with a corrupted or locked EFI chip. The 820-xxxx number and the letter revision are printed on the logic board and should match. Read and save the original SPI chip first, check the image size against the flash capacity, and expect to restore the serial 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 @bios_laptop. Enginerys does not host this file.
All sources (2)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @bios_laptop | 15 Jun 2022 | Open file on RM Schematics |
| @Satale_bios_esquemas_Laptop | 27 May 2023 | 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 →