Asus update , from asus website , if you want to flash in windows , some now come with easy flash in bios where you can flash from usb , thats what i do now as its works well. Never had a failure with asus update though , just go to asus website and click downloads , enter your board type and its under utilitys
edit just noticed you have a striker , then you can flash using usb
In bios under tools EZ Flash 2 its called , just have bios file at the ready in usb , enter utility and select file and wait , prey you dont get a power cut