The ECS Q77H2-AD, revision 1.0, is the subject of this 1.46 MB RAR package. The file name does not describe the contents further, so unpack it to see whether it holds schematics, a BIOS dump or both. On a board of this kind the documentation helps with tracing the VRM, the DDR supply and the standby rails, and with locating test points when the system will not power on. Any firmware image should match the SPI flash capacity exactly; read and keep the original chip contents before writing a replacement.
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 @IT_SERVICE_WORLD. 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.