I have a jailbroken 4s. I am thinking of updating to iOS 6 thus unjailbreaking my phone.. I think I can live with this until an untethered jailbreak comes out. What do I need to do so I can jailbreak again in the future without any problems. I've known people who update to a new version , lose the jailbreak and try to jailbreak again and it won't let them or there is a complication. Thanks.