How To: Untethered Jailbreak Apple TV 2 with RC6

• Another kudos to awesome effort of Chronic Dev Team!

• Finally the Jailbreak for Apple TV 2 has been release by the fantastic Chronic Dev Team! When the team release GreenPois0n RC5, it did not support Apple TV2. 
• Greenpois0n RC6 now available for both Windows & Mac machines that untethers Apple TV 2G jailbreak on iOS 4.2.1.

To be able to untether iOS 4.2.1 on Apple TV 2G, you have to follow the step by step guide posted here or here and you'll get Apple TV 2G untethered jailbroken on iOS 4.2.1. 

STEP 1: Your device must be on iOS 4.2.1, then download GreenPois0n RC6 for Mac OS X

STEP 2: Launch GreenPois0n RC6 then connect your ATV2 into your Mac via USB and click on Jailbreak as shown below:

 

STEP 3: Follow the instructions shown on the screen to enter DFU mode:

 

STEP 4: Once jailbroken, you'll get Cydia installed on your iOS device and you won't need to use Just tethered boot right now option anymore.

 

Download links of greenpois0n RC6 below:

Download Greenpois0n RC6 for Mac OS X
Download Greenpois0n RC6 for Windows
Download iOS 4.2.1 for Apple TV 2G