ROM dump for an Apple MacBook on logic board 820-3023-A, tagged K21 in the name, which is likely the internal project code. The tokens 051 and 8870 may refer to a firmware build or chip marking, but their meaning is not certain. The 3.68 MB rar is intended for rewriting the EFI SPI flash with a hardware programmer. Check the board number and revision printed on the logic board. Save the original chip contents first, because Mac dumps can carry machine-specific serial data.
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 | 30 Jan 2019 | Open file on RM Schematics |
| @IT_SERVICE_WORLD | 28 Oct 2019 | 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 →