The untethered jailbreak solution for iOS 5.1.1 is going to be released in the next few hours and you'd better prepare to use it with your own iDevices. Here I have given you some information which helps you to update by saving your information from your own iDevices and if you haven't followed it, maybe it would be good to do so if you are thinking of updating to iOS 5.1.1. In addition to the information available there, I must recommend you to save your SHSHs with TinyUmbrella because you will surely need them at one point or another.
Finally, I remind you that iPhone 4 terminals decoded with Gevey must not be updated to the latest version of iOS without a custom ipsw that keeps the baseband intact. For now, only redsn0w allows you to do this, other similar programs are not available. I will let you know when the untethered jailbreak solution is available.
