How to restore a Dev phone to normal

Hi guys i was looking at buying a 2nd hand iphone. But its a dev phone. The guy says he has tried to restore it through itunes, but it always fails. Any ideas? Thanks

Depends on what OS is currently on the phone. Apple does not allow you to downgrade to 3.1.3 if 4.0 beta is on the phone, so you'll have to wait until 4.0 is officially released. You could try going into recovery mode to see if you can install 3.1.3, no guarantees it will work though:
1. Turn the phone completely off and disconnect it from cable/dock.
2. Leave the USB cable connected to your computer, itunes running.
3. Hold down the home button on the iphone.
4. While holding down the home button connect it to your computer.
5. Keep holding down the home button until you see a connect to iTunes screen.
6. If successful, you should be able to restore as a "new" device.

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