Today i tried upgrading my pantech burst to ice Cream Sandwich. I downloaded the Pantech Burst OS upgrade tool and everything else required from pantechusa.com, but when I open the Pantech OS upgrade tool, it says to put my phone into download mode and then connect my phone to the computer. I did this, but it says that the USB cable is disconnected, and that it can't find my phone. I tried this many times, but it still won't work.