Hard Reset GOOGLE Nexus One

1. First please power off the phone.
   
2. Next hold and press Volume Down + Power button.
   
3. When you see menu with options, then release holded buttons.
   
4. Now select option Clear Storage from the list by pressing the Volume Down button.
5. Then press the Power button, and confirm by pressing Volume Up.
6. Success!

Reset Nexus One to Factory Settings

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WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.