Firmware dump for the Apple iMac A1225 logic board, with the name giving the board number as 820-211-A (likely shortened from the usual Apple 820 numbering), stored in a 2.48 MB RAR. Such an image is written to the logic board's boot flash chip with an SPI programmer to recover a machine with corrupted EFI firmware. Verify the 820 number on your board exactly, read and keep the original chip contents before writing, and confirm the image size matches the chip, since a mismatched file will not fit.
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 | 10 Jan 2024 | Open file on RM Schematics |
| @generalbios | 4 Nov 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 →