BIOS archive labelled for the Biostar AA70K-M2S desktop motherboard, version 6.4, although the catalogue lists ECS as the brand. The 2.54 MB RAR should contain the flash image for the board's SPI chip. Technicians use these dumps to rescue boards that are stuck in a boot loop or show no video after a failed update, programming the chip off-board or with a clip. Confirm the exact model and PCB version printed on the board, save the original contents, and make sure the image size equals the chip capacity 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 →