I tried to used my iphone4s to update my fx100,after a while.unfortunately,APP displayed my fx100 updating stuck too long,and then i though that was finished,and to switch off my fx100. but when i was restarted my fx100,my iphone4s can not connect with the bluetooth. i tried to via my PC to update again, but system said "fail update instruction '. still could switch the 2.50.2 update. any idea for this?