i have an iPhone 4 that i recently jail broke with redsn0w. Everything worked great for the first day until i went to reset it because i had installed winterboard. Before i continue i would also like to make it clear that i reset it about four times previously without any problems. Now the phone will not go into DMU mode after countless times of trying with a plethora of different programs, and when i start it normally it will just show the apple logo and do nothing. My computer won't recognize it and i can't even get it into restore mode. Please help me i need the phone and am really in trouble if it doesn't work.