The untethered jailbreak for iOS 4.2.1 may well be so simple as putting in a package deal from Cydia over your present Redsn0w tethered jailbreak – Sure, you don’t wish to repair or re-jailbreak your iOS devices.
It is important to note that the iPhone Dev-Team already has a backup plan ready, but that will require iOS 4.2b3 SHSH blobs for untethered jailbreak. Comex is said to have a more efficient untethered jailbreak method for iOS 4.2.1. This untethered solution will almost certainly be applicable to all current iOS 4.2.
1 devices, including the new A4-based ones which includes iPhone 4, iPad, Apple TV 2G and iPod touch 4G.
That’s the update for now the rest of the story has been covered in detail in the previous posts on untethered jailbreak stories. Stay tuned for now and we will definitely have more to share as reports on releases break out, there’s still the entire weekend for the expected releases.