I got a factory unlocked 4S the other day. I'm looking to update to 5.1 since the battery is terrible with 5.0.1, but I want to try to stay on 5.1, since I'd imagine the jailbreak would be more likely there. Is there any risk if I get an ipsw from the internet that it'll lose the unlocked state? Or am I mistaken on what the unlock is/where the unlock resides?