The bios here are ONLY for vistax64=http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=2100&lc=en&cc=us&dlc=en&sw_lang=&product=1817074#N1617
It comes with WINFLASH installed, as you only have to run the wizard to flash the new bios.
What version bios do you have now?
There is risk, why do you need a bios upgrade if things are working?