BIOS image for the Acer Veriton X6620G desktop, whose motherboard is identified as Q77H2-AD, packed in a RAR archive of roughly 4.18 MB. The Q77 in the board name points to the Intel Q77 chipset family. A dump like this is used to restore a system that will not boot or posts with corrupted settings, by writing the image to the SPI flash with a programmer such as a CH341A. Read and save the original chip first, and check that the image size matches the chip capacity.
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 →