Chronic Dev Team has finally released GreenPois0n RC6 which brings full support for untethered iOS 4.2.1 jailbreak on Apple TV 2G.
Everything else remains the same. If you have already jailbroken your iPhone, iPad or iPod touch with GreenPois0n RC5, there is no need to re-run the jailbreak. But in case you wish to, simply re-run it over your existing GreenPois0n RC5 untethered 4.2.1 jailbreak and you are good to go!

The following guide will help you jailbreak Apple TV 2G, untethered on iOS 4.2.1 using GreenPois0n RC6.

Step 1: Download GreenPois0n from the link given below. Run it, and click “Yes” when it prompts for jailbreaking Apple TV.

Step 2: Connect Apple TV 2G to your computer using micro-USB cable and click on “Prepare to Jailbreak (DFU)”.

Step 3: Now follow the following onscreen instructions to enter DFU mode:

  • Plug Apple TV in to USB (7 seconds)
  • Plug in power adapter (3 seconds)
  • Press and hold MENU and PLAY/PAUSE (7 seconds)
  • Release both buttons

Step 4: GreenPois0n will now start “Jailbreaking” Apple TV 2G untethered on 4.2.1. The process will take around 3 to 4 minutes to complete.

Step 5: Your Apple TV should now be successfully jailbroken untethered on iOS 4.2.1. Once done, unplug it from your computer and connect it to your TV again. Navigate to “greenpois0n” menu and select “Inject Software” option to install Cydia package.

You can download it from the following links
GreenPois0n RC6 for Mac
GreenPois0n RC6 for Windows

Since the GreenPois0n’s service is going down, you may like to try the following mirrors
GreenPois0n RC6 for Mac
GreenPois0n RC6 for Windows

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