which one is more efficient to get my warranty back without detecting my phone was jailbreak, restore as new phone or from backup after jailbreak? i've read in someone's thread that we need to do a "reset" to our iphone before restore with itunes in other threads, they said restore in DFU mode. i dont want to leave any evidence about jailbreak in my phone before i send it back to apple. sorry for my english. Please help!