i currently have iphone 4 jailbreak by jailbreakme. now i am going oversea so i need unlock. i have purchase gevey sim ultra and they are saying that it dosent work with jailbreakme. is there anyway i can unjailbreak the jailbreakme and then rejailbreak with redsnow with out updrading firmware. did any one use gevey sim(automatic) with jailbreakme.