Apple firmware archive for logic board 820-2914-A, project code DF92, listed with order number MC725LLA. The 820- prefix is Apple's logic board numbering and the trailing letter is the board revision, both printed on the PCB. The 3.81 MB RAR should hold a SPI ROM dump for programming with an external tool on boot or EFI faults. Read and save the original ROM first, since it holds the serial number and other machine-specific data, and confirm the image matches the chip size.
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 (6)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 26 Oct 2020 | Open file on RM Schematics |
| @biosarchive | 26 Oct 2020 | Open file on RM Schematics |
| @biositechyangiyer | 2 Dec 2020 | Open file on RM Schematics |
| @biositechyangiyer | 1 Feb 2021 | Open file on RM Schematics |
| @biosdumpcomputer | 26 May 2022 | Open file on RM Schematics |
| @biosdumpcomputer | 26 May 2022 | 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 →