Two words phrases we throw around a lot: Soft reset and hard reset. The former is what it’s called when you turn your phone off and on, or pull the battery. The latter is a bit more drastic. But sometimes things go wrong, and you need to restore it back to its factory settings, wiping all of your applications and personal data. Here’s how you hard reset the Google Nexus One:
1. With the phone off, hold the Volume Down button and press and release the Power button.
2. You’ll boot into the menu you see above with the little skateboard guys. Select Clear Storage from the list by pressing the Volume Down button.
3. Press the Power button, and confirm by pressing Volume Up.
4. Sit back while your phone reboots in its virgin state.
More here:
How to: Hard-reset the Nexus One | Android Central
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