I managed to jailbreak iphone 3GS using Pwnagetool 4. But the problem is Cydia wont launch now. I need to use Cydia. It crashes before anything really comes up. I managed to unlock my iPhone by help of some website. For unlocking I placed two .deb files in a specific location. I can use SSH due to Cydia. I cant even unlock it again and many people have reported this Cydia crash. What should I do to solve cydia crash caused due to ios4 jailbreak ?