Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5) Hey.. I have an iPhone 4 jailbreaken running iOS 4.3.3 I want to unjailbreak it now. Does doing a restore on iTunes update my firmware or something? Is there any harm in doing this? Plz advise.