Firmware archive for the Apple MacBook model A1425, logic board 820-3462 at revision A, stored as a 4.3 MB RAR. The 820 prefix is Apple's own board numbering, and the trailing letter denotes the board revision. Technicians use such a dump to rewrite the EFI SPI flash with a programmer when a Mac shows no boot chime or is stuck after corruption. Read the original chip first to preserve the serial and system data, verify the 820 number on the board, and confirm the image size fits the flash.
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 | 17 Apr 2018 | Open file on RM Schematics |
| @one5technology | 10 Nov 2020 | Open file on RM Schematics |
| @generalbios | 8 Oct 2023 | Open file on RM Schematics |
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →