Firecore has released an updated version of Seas0nPass that includes an untethered jailbreak for the Apple TV 2 on iOS 4.2.1 (Apple TV 4.1.1). It’s Mac only for now (OSX 10.6 or later) but according to Firecore, Windows version is also being finalized with the untether and will be available soon. If you’ve already jailbroken with greenpois0n (RC 6 or RC 6.1) you do not need to re-jailbreak – both Seas0nPass and greenpois0n contain the same jailbreak components.
Greenpois0n RC6 has finally been released by the fantastic Chronic Dev Team. This magical piece of software jailbreaks your Apple TV 2 on iOS 4.2.1 (Apple TV 4.1.1) in a flash. And this is untethered jailbreak, meaning you don’t have to connect your atv2 to your mac/pc every time you need to reboot it.
Here is the step-by-step tutorial on how to jailbreak your Apple TV 2 using greenpois0n rc6.