Firmware dump for the Apple iMac A1418 with logic board 820-01069, revision B, read from a Winbond W25Q64FV flash chip and marked as tested OK, packaged in a 3.7 MB RAR. Apple uses the 820-xxxxx pattern for its board numbers, printed on the logic board itself. The image is written to the 8 MB SPI chip with a programmer to fix boot failures or a corrupted EFI. Keep a backup of the original chip, since it contains the serial number and other machine-specific data that a generic dump will not carry.
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 | 24 Dec 2023 | Open file on RM Schematics |
| @Laptopbiossolutions | 26 Dec 2023 | Open file on RM Schematics |
| @generalbios | 14 Jul 2024 | 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 →