Firmware image for the Apple logic board 820-00923-A, where clear-me in the name points to a dump with the Intel Management Engine region cleaned. The RAR is 4.32 MB. A clean ME region is useful when a Mac fails to boot because ME data is corrupted. Write it with an SPI programmer after reading and saving the original, since the serial number and other unique data may need to be moved over from your own dump. Check the revision letter on the board.
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.
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 →