Firmware image for Apple logic board 820-00629-A, sized for an 8 MB flash chip and packed in an 8.84 MB RAR; the Mac model is not given in the name. Such an image is written to the board's SPI EFI chip with a programmer when the firmware is corrupted or locked. Always read and save the original chip first, because it holds machine-specific data such as the serial number, and confirm the extracted image is exactly 8 MB to match the 64 Mbit chip before writing.
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 →