Plug the iphone into your computer and restore the phone using itunes. If the computer won't recognize the phone put it in DFU mode by doing the following.
1. Hold the lock/unlock button for 10 seconds.
2. Continue holding the lock/unlock button and also hold the home button for 10 seconds.
3. Release the lock/unlock button and continue holding the home button for 10 seconds.
After the connect to itunes screen appears on the phone, plug it in and attempt to restore again.
INSTRUCTIONS:
1.Click
the "Settings" icon.
2.Select
"General."
3.Scroll
to the bottom and select "Reset."
4.Select
"Erase All Content and Settings." A warning message will display.
Confirm your selection. The iPhone screen will turn off then show a
"waiting" sign. After formatting is complete, the Apple logo will
display and finally your formatted iPhone will reboot.
Read more: How to Format an
iPhone 3G ' eHow.com http://www.ehow.com/how_7640130_format-iphone-3g.html#ixzz1WCkuLtuM
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