I think untethered iOS 5.1 jailbreak is the quickest jailbreak in iDevices history. On the very first day of iPad 3rd generation’s launch i0nic from Germany, whose real name is Stefan Esser, has successfully jailbroken the device untethered-ly using a new method.
And the tweets from German hacker also indicate the same technique can provide untethered jailbreak on other A5 devices namely iPhone 4S and iPad 2 and on older devices like iPhone 4, iPhone 3GS, iPod Touch 3G, iPod Touch 4G and iPad first generation.
MuscleNerd has already shown us his jailbreak. The screenshots of which we have already posted in our post. But that jailbreak is tethered only and iPhone dev team will never release this method for general users. On the other side, as we were expecting, Chpwn and his co-fellows also claim a new method of jailbreak compatible with iOS 5.1 running on all iPad, iPhone and iPod Touch models.
Current iOS 5.1 Jailbreak Methods:
- Untethered Jailbreak method for the new iPad by i0nic
- Jailbreak method by MuscleNerd
- iOS 5.1 jailbreak by Chpwn and phoenixdev

i0nic or any of other hackers didn’t mention anything about untethered jailbreak ETA (estimated time of arrival) for iOS 5.1. They might take 1-2 weeks to remove the bugs and to make the jailbreak friendly for all devices.