Jailbreaking iOS 4.2.1 w/ Greenpois0n

After my last Jailbreaking post for iPhone 4 and the response from it, I thought I’d let everyone know about an update if you’re on 4.2.1 and want an untethered Jailbreak.

  1. Download greenpois0n onto your Mac. (Some users have been reporting the servers being down. If you can’t get it to download right away, just be patient. Their servers are probably just lagging from all the traffic. There are a few mirrors out there so be sure to check the comments for the latest updates on those.
  2. Plug your iPhone, iPod Touch, iPad, or AppleTV in via USB (make sure the power is off) and follow the on-screen instructions to enter DFU mode.
  3. Greenpois0n will recognize when your phone is properly in DFU mode and start to do its thing. After it’s done, you’ll see a Loader icon on your homescreen. Tap it and install Cydia. (Note: This only differs for AppleTV jailbreakers. You’ll be done but need to continue accessing and installing apps via Terminal and SSH.)
  4. You’re done! Restore all your stuff (if you choose to or were stock before) and enjoy being jailbroken!

Here is a video as well, for those that like to see the Jailbreak in action before trying it on their phones.

Let me know if you have any questions in the comment box below.

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