i need help. my iphone is stuck on DFU mode, wont start, cant update. i jailbroke it cant remember what FW but im sure i made my BB to 6.15 so i can unlock it. i mis-updated my phone into 4.3.x and now it wont start...tried every video on youtube, nothing seems to work. PLEASE HELP ME. JUST BOUGHT THIS 2 MONTHS AGO