When i tried to sync my iphone 4 with itunes it showed me a message saying it couldnt read my iphone and i should restore. And when i went to private/var/mobile/media/itunes_control/itunes and deleted the itunes db file. Then i also deleted my music and rintones. and when i tried to sync it still didnt work. and showed the same message. Can someone please tell me if i have to delete anything else? OR any other options?