Apple logic board firmware dump for board 820-3059, revision A, marked as ok, which suggests a working read taken from a functioning unit. It is supplied as a ZIP of about 3.81 MB holding a BIN image for the EFI/boot ROM SPI chip. Apple uses the 820-xxxx pattern for its logic board part numbers, so confirm the number silkscreened on your PCB before flashing. Read and keep the original ROM first, note that serial and system data may need to be transferred, and check the image size matches the chip.</nowiki>
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 @vinafix_bios. 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 | |
|---|---|---|
| @vinafix_bios | 23 Nov 2025 | Open file on RM Schematics |
| @vinafix_bios | 23 Nov 2025 | 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 →