Apple MacBook firmware archive for model A1708, logic board 820-00840-01. Apple marks its logic boards with 820-xxxxx numbers, and the suffix indicates the variant. The file is meant for reflashing the EFI firmware chip with a programmer when a machine will not boot or is firmware-locked, but check its contents after extraction. Always read and keep the original chip data, since it holds serial and configuration information, and make sure the board number engraved on your logic board matches exactly.
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 | 23 Feb 2019 | Open file on RM Schematics |
| @IT_SERVICE_WORLD | 28 Oct 2019 | 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 →