Coming soon. untethered Jailbreak for iPhone 4 and iOS 4.2.1

Seems like an untethered Jailbreak for iPhone 4 and iOS 4.2.1 is almost ready.  Here is a demo of booting an jailbroken iPhone 4with iOS 4.2.1 using 4.2b3 kernel.

Tags: iOS 4.2.1 iPhone 4 untethered Jailbreak