Firmware dump for the Apple Mac mini A1347 with logic board 820-5509-A, described in the name as a fully working BIOS image. Apple's 820-xxxx numbers identify the logic board and the trailing letter its revision. The file is used to reprogram the EFI boot ROM SPI flash with an external programmer when the machine shows no chime, no video or corrupted firmware. Read and save the original chip first, since it holds the serial number and system data, and verify the dump size fits the installed ROM.
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 | 1 Mar 2023 | Open file on RM Schematics |
| @generalbios | 4 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 →