I recently upgraded to the S5 and wanted to turn my phone back in to Sprint for a credit. When I went to flash it back to stock using Odin the USB connected then randomly disconnected during the flash. Now it won't boot into anything but emergency mode and wont stay connected in Odin long enough to flash. I made sure the drivers installed and the pc could see the phone when plugged in. I am using a cord that is only a couple of weeks old. At this point are there any options to put it back to stock or am I out of luck? I never used Kies either. Thanks in advance for the help.