Apple MacBook A1347 firmware dump for logic board 820-2577-A, a 4 MB image packed in a 2.66 MB ZIP archive. The A1347 is the Mac mini model number used by Apple, and 820 is Apple's own prefix for logic boards. Technicians write this file to the EFI SPI flash chip with a programmer to fix no-boot or no-chime faults. Serial and system data in a donor image may need correcting afterwards. Back up the original chip first and confirm the board number and the 4 MB 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 (4)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 4 Jan 2022 | Open file on RM Schematics |
| @pepeelectronica | 21 Apr 2022 | Open file on RM Schematics |
| @schematics_bios | 24 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 31 Jul 2026 | Open file on RM Schematics |
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →