BIOS / EFI firmware archive for the Apple A1398 MacBook Pro logic board 820-00138, revision A, compressed to 4.86 MB. A1398 is the 15-inch Retina model identifier, and 820-00138 follows Apple's internal board numbering. Technicians flash such an image onto the SPI chip with a programmer when a board will not chime or boots erratically due to a damaged ROM. Read the original chip before writing, since serial and other unique data may need to be transferred, and confirm the board number on the PCB 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 (3)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 25 Apr 2021 | Open file on RM Schematics |
| @BiosSchematicWorld | 5 Dec 2021 | Open file on RM Schematics |
| @schematiclaptopramkushwaha | 13 Jul 2025 | 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 →