@BIOS will not work with windows 7 ... need windows XP to flash the bios if you are using the beta ones...but official BIOS are being recognzed by Qflash ...updated my ud7 to F4 and seems ok ... have tried the 2600K that I borrowed and 4.8Ghz is doable on air... seems like the processor is the one thats holding back since i tried it on ud7, ud5 and gd55 and all are getting 4.8xxGhz only... F4 bios is better than f3 since f3 is displaying weird voltages in ET6.