BIOS image for the Apple A1419 iMac logic board 820-3478, sized for an 8 MB flash chip, packed in a 3.92 MB RAR. Apple identifies its boards with 820-xxxx numbers, so check the silkscreen for an exact match. Technicians write this kind of dump with an SPI programmer to fix boards that will not chime or boot because of corrupted firmware. Read and save the original chip first, since it carries machine-specific data such as serial information. Make sure the image size matches 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 | 4 Jun 2022 | Open file on RM Schematics |
| @fileservicelaptop | 13 Jun 2022 | Open file on RM Schematics |
| @fileservicelaptop | 13 Jun 2022 | 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 →