STEP 1. First you have to download GreenPois0n RC6 for your Apple TV 2G then run it.
STEP 2. Then you have to click on “YES”, when you will be asked for jailbreaking Apple TV.
STEP 3. Using micro USB cable you have to connect Apple TV 2G to your computer and then you have to click on “Prepare to Jailbreak (DFU)”.
STEP 4. Now you have to enter DFU mode by following the instructions given below:
- Simply plug Apple TV in to USB for 7 seconds
- Then plug in power adapter for 3 seconds
- Now press and hold MENU and PLAY/PAUSE button for 7 seconds
- Then simply release both buttons
STEP 5. Now GreenPois0n will start “Jailbreaking” your Apple TV 2G untethered on iOS 4.2.1. You have to wait for 3 to 4 minutes until the jailbreak process completes.
That’s it. Now your Apple TV 2G should be jailbroken untethered on iOS 4.2.1. You can download GreenPois0n RC6 for Mac from here. You can download GreenPois0n RC6 for Windows from here. If you found any difficulty in following the above steps then feel free to ask in the comment section below.