[hiflyer]

Try This:

1. Let’s get into DFU Mode. Connect to your computer, hold the power and home buttons down (the iphone will power off after about 10 seconds, but keep holding both buttons down)
2. As soon as the iPhone powers off, (black screen) release the power button (but keep holding the home button down). (If you see the apple logo or connect to itunes logo you are not in DFU mode so try it again)
3. After about 20 seconds or so, Itunes should see your iphone. It is now safe to release the home button, and your iPhone is in DFU mode.
Now iTunes should ask you to restore its firmware.

Restore to 1.1.4 and jailbreak with iliberty+