If you’ve already jailbroken an iOS device running the latest iOS 6.1 software using the tethered jailbreak, then you won’t need to restore it and perform the whole process again to get an untethered jailbreak later today when evasi0n drops. Although this is recommended, you will be able to convert your existing jailbreak into an untethered one using a simple tweak available through Cydia.
According to iDownloadBlog, there’s an as yet unnamed upcoming Cydia tweak that will “convert” tethered iOS 6.1 jailbreaks into untethered ones — just like the Rocky Racoon tweak that was used to convert the iOS 5.1.1 jailbreak. Simply install the tweak when it becomes available later today, and you’re good to go.
However, it is recommended that you start from scratch and restore your device back to stock iOS 6.1, then perform the jailbreak again using the upcoming evasi0n tool. MuscleNerd, one of the hackers behind evasi0n, points out that the debian (the Cydia tweak) hasn’t been thoroughly put through its paces like the evasi0n tool has. Therefore, it’s possible you could run into problems that haven’t yet been discovered.
If you can, then, perform a restore to iOS 6.1, then jailbreak again later today using evasi0n. It might take a little more effort, but it’s better to be safe than sorry.
The evasi0n tool is currently 99% complete, according to its official web page, and we’re expecting it to drop at any time. As soon as it does, Cult of Mac will let you know. This is the first untethered jailbreak for iOS 6.1, and the first to support the iPhone 5 and the iPad mini.