While the official website has not yet sent out any guides to do an untethered jailbreak for iOS 5.1, there has been a lot of talk about pod2g releasing the iOS 5.1 untethered jailbreak. There are now several websites that have the downloads ready for your Mac / Windows using which you can jailbreak your iOS 5.1 device untethered.
A short video tutorial too has been attached. You can download Greenp0ison to jailbreak untethered iOS 5.1. So far, all the other softwares like Redsn0w and Sn0wbreeze have been only capable of creating a tethered jailbreak.
The benefits of an untethered jailbreak over a tethered jailbreak is just one – but it’s the most vital thing. You can restart your iPhone or iPad without having to connect it to your system and reboot via the jailbreak tool.
The Greenp0ison team announced on April 19th that the untethered jailbreak was finally out. Here are some websites which can get you the file. However, what’s not impressive is that you will need to fill out a short and simple survey in order to download the file. We are not sure why this is being done (one website reports that this is to prevent leech backs) but this would turn out to be slightly annoying in sometime.