1. In the device Options, click Security. If you are using BlackBerry Device Software 4.1, click Security Options > General Security.
2. Click the trackwheel and select Wipe Handheld.
3. Click Continue.
4. Type blackberry. All the data on the BlackBerry device is erased.
I am not sure with the pearl but did you try: Go to Options / Security Settings / General Settings, then click the Menu button and choose "Wipe Handheld". You will need to type in blackberry to confirm your request.
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