STUCK AT 90% ON BETA 3 >SOLUTION<

If you are stuck at 90% during install follow these steps!

1. Let sit for at least 15 min after being stuck to ensure the process is done (you should still see no progress after the 15 min)

2. Hold the Home Button and Lock button until the phone reboots and the Apple Logo appears.

3. Let phone boot and there you go. You are inside Beta 3.