Jailbreak iOS 4.2.1

Dev Team has released a jailbreak Greenpois0n RC5 to IOS  4.2.1 based devices like iPhone, iPod touch, and IPAD. This jailbreak is untethered release so that users can perform a reboot of the device without the need to re jailbreak.

Jailbreak is available first for the Mac version, followed a day later appeared jailbreakfor Windows version. Before performing the jailbreak users advised to make backups ofpersonal data and the installation was done by using iTunes.
The steps to jailbreak the iPhone is as follows:

1. Make sure the device is using IOS 4.2.1 because Greenpois0n only works on this firmware
2. Download Greenpois0n
3. Plug the iPhone to the computer using a USB cable and then run Greenpois0n. Click the "Jailbreak".
4. Immediately after pressing the jailbreak, follow the instructions to make the iPhone into DFU mode:
   - press and hold the sleep button for 3 seconds
   - press and hold the sleep button while pressing the home button for 10 seconds
   - release the sleep button but keep pressing the home button for 10 seconds
5. The device will now be ready to jailbreak. Wait a moment while doing his duty Greenpois0n
6. After the jailbreak put into the iPhone it will show a new icon on the Spring Board for theLoader. Launch Cydia Loader and install from there, reboot iPhone it will be installed Cydia 
7. Completed

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