Working BIOS for an Apple MacBook Pro, the model written as 1278 (probably A1278), on logic board 820-3115 revision B, archived as a 4.72 MB RAR. Apple identifies logic boards with the 820-xxxx numbering etched on the PCB. This firmware is written to the SPI chip with a programmer to recover a board that will not chime or boot. Save the original dump first, as it contains the serial number and other unique data, and confirm the board number matches.
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 Aug 2024 | Open file on RM Schematics |
| @generalbios | 5 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 →