Write an article based on this "Back up and save all your personal data to a computer, memory card, or third-party cloud storage application. Press the Menu button. Navigate to and select “Options. Scroll to and select “Security Options. Scroll to and select “Security Wipe. Verify that all items in the list are checked, then press the trackpad. Type “blackberry” into the text field, then highlight “Wipe” at the bottom of the screen. Press the trackpad to initiate the factory reset."

Article:
Restoring your Blackberry to factory settings will wipe all data.  ” ” ”   Your Blackberry device will reset and restart when finished.