you only flash bios for a reason
1) sometimes you can not unflash or go backwards with bios, so only flash if need it
2) some bios that are new may not help you - in fact they may hurt you
reasearch your cpu and ther best bios
3) most bios updates are too solve issues or too add new processors
if you have an old processor you may fine the new bios retarts oc-ing or other issues and sometimes your stuck with it
4) if you flash wrong you fried your mobo if you chip is solder on - high mobos have gotten away from removal chips
interpution of flashing is very bad, turn off all oc when you flash too
Bottom line is should research your bios options and cpu choice, never flash unless you need too. My take
different mobos have different ways, i flash with usb though bios