I upgraded from my iphone 3GS to the new iPhone 4 just a few hours ago and am now left with a newer firmware IOS 4.0.2. Is there any jailbreak for this new firmware? Can I downgrade back to 4.0.1 without any problems? I have SHSH files for my old iPhone 3GS but not sure if it'll be compatible with my iPhone 4...any help would be great and sorry for the newb Q's.