If you are in the boat I was and need to go back to the safe haven that is 3.1.3, follow the steps below:
Step 1: Unplug (if plugged in) and turn off your iPhone: not to be confused with putting your phone in stand-by, press and hold the power button until a “Slid to power off” is displayed. Then, slide to power off.
Step 2: While pressing down the Home button, connect your iPhone to the computer. Keep holding down the Home button until you see a “Connect to itunes” on the phone. If iTunes is open, it will prompt you restore your iPhone. Click “Restore” in iTunes and let it do its thing
Step 3: At the end of the restore, you will get an error 1015. This is normal.
Step 4: Quit and exit out of iTunes.
Step 5: Download BlackRa1n from http://blackra1n.com/ and run it
Step 6: Click the “Make it Rain” button in BlackRa1n and the iPhone screen should go black.
Step 7: Wait a couple of minutes and then unplug and turn off the iPhone
Step 8: Turn the iPhone back on and it should boot as normal
Step 9: You can now restore your backup from iTunes and resync all your apps and media
Step 10: Go back to http://blackra1n.com/ and make a donation!
