Is there anyway to backup jailbreak unlocked (not factory unlocked) iphone 3gs, ios 4.1. I want to install iOs 5.1 on it but I am afraid that doing so might country lock my phone again. Thus i want to backup my phone then do IOS update apply jailbreak and if anything goes wrong revert back to iOS 4.1 using the backup that i did earlier. Is there any way to backup device so after restore it stays unlocked.