Firmware image for an Apple MacBook model A1502 logic board 820-3536, revision a, described as having the firmware password cleared, packed in a 3.95 MB RAR. Apple uses 820-xxxx numbers for its logic boards, so check the number etched on the board before flashing. Technicians write such cleaned images to the EFI SPI flash to remove a firmware lock or repair damaged firmware. Save a read of the original chip first, as it holds the unique serial and network data, and confirm the size matches the chip.
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 (3)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 5 Jan 2019 | Open file on RM Schematics |
| @IT_SERVICE_WORLD | 28 Oct 2019 | Open file on RM Schematics |
| @one5technology | 10 Nov 2020 | 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 →