Instructions for updating the BIOS are included in a text file with the download.
Run 'Exe' file to update BIOS through Windows, run 'bat' file to update from a pure DOS environment.
You can't flash the BIOS if your laptop keeps shutting down, that isn't going to be fixed by flashing the BIOS anyway because it's probably a faulty hardware problem or overheating and a BIOS update won't fix that.