I installed iOS 5.0.1 on my iPhone 4 using Sn0wbreeze to preserve my baseband since I need the unlock. The iPhone boots up fine, the Cydia icon shows up too. But it just doesn't load. Everytime I touch the Cydia icon it seems to boot up and shut down immediately. I have re-installed iOS 5.0.1 thrice. I even used Sn0wbreeze to recreate the IPSW a second time. No use. What could be the issue? I need Cydia in order to use Ultrasn0w. Thanks.