Firmware dump for the Apple iMac A1418, EMC 2889, on logic board 820-00430 revision A, packed as a 3.77 MB RAR archive. Apple uses the 820-xxxxx pattern for its own logic board part numbers, so compare the number silkscreened on the PCB with this one before flashing. Technicians typically write such an image to the SPI boot ROM with an external programmer when a Mac shows no boot, a firmware lock or a corrupted EFI. Read and keep the original chip contents first, since serial and system data live in that region.
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 | 3 Nov 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 →