Firmware image for the Apple MacBook Pro A1286 logic board 820-2850-A, supplied as a 2.02 MB ZIP. The name says the dump is confirmed working and has a cleaned ME region, which helps when a corrupted boot ROM leaves the machine without chime or video. Apple uses the 820-xxxx pattern for its own logic board numbers, with the letter suffix as revision. Verify the number silkscreened on the board, dump the existing SPI chip as a backup, and make sure the image size matches the flash part before programming.
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 | 31 Mar 2021 | Open file on RM Schematics |
| @Satale_bios_esquemas_Laptop | 31 Mar 2021 | Open file on RM Schematics |
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →