Trying to reset an iPhone 3GS. Passcode is unknown to me

     I am trying to reset my brother's iPhone that he no longer uses. He has upgraded to the iPhone 4. I do not know his passcode. I am unable to reach him to retrieve the passcode. How would I go about resetting the phone?
     When I try to reset it by holding the Sleep/Wake and Home buttons, the phone's screen just flashes at me. It does that as well when I try to shut it off.

You would have to restore the phone on the last computer it was synced with.  If you can't you would have to force it into recovery mode and restore it as a new iPhone, erasing all data and settings (http://support.apple.com/kb/ht1808).

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