Clean EFI firmware dump for the Apple iMac A1419, EMC 2639, logic board 820-6478-A. Clean usually means the dump has had its machine-specific data such as serial number or lock settings removed, so the board's own serial may need to be restored. The 3.95 MB RAR is used to reprogram the boot ROM with an external programmer after corruption or a failed update. Confirm the 820 number and revision on the board, back up the original ROM first, and check the image size matches the flash chip.
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 (2)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 2 Dec 2018 | Open file on RM Schematics |
| @IT_SERVICE_WORLD | 28 Oct 2019 | 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 →