Have you tried a hard reset? Performing a hard reset will reset your Blackberry back to factory settings. I would advise you before performing a reset, make sure you back up your device with your desktop access manager. Follow these directions to reset your device:
1. In the device options, click Security Options.
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2. Click General Settings.
3. Press the Menu key.
4. Click Wipe Handheld.
5. To delete all third-party applications from your device, select the Include third-party applications check box
6. Click Continue.
7. Type blackberry.