![How To: Jailbreak iOS 4.2.1 (Untethered) [Mac]](https://wpuploads.appadvice.com/wp-content/uploads/2011/02/jailb1.png)
How To: Jailbreak iOS 4.2.1 (Untethered) [Mac]
February 5, 2011
What Devices This Works On
- iPhone 3GS, 4
- iPod touch 2G, 3G, 4G
- iPad
- A Mac running OSX 10.5+
- iTunes 10.1+
- GreenPois0n RC5b3 (click here)