Without Pc you Can do this :
- Erasing the data with the Wipe Handheld option Go to Options.
- Then go to Security.
- Then go to General Security.
- Click the trackball and choose Wipe Handheld.
- Then choose Continue.
- Then type blackberry and all of the data should be erased.
To Using PC connection you can do this Erasing the data and applications
- First connect to Desktop Manager on your comptuer.
- Double click the Application Loader icon.
- Click Next to go through the Wizard.
- When asked for your password type in an incorrect password and click Next.
- You will need to do this ten times.
- Then choose Close.
- The device will become unresponsive in a 507 error without any software.
- To re-install software open the Application Loader and choose the software or applications you would like to install.
Clearing device databases
- Connect to Desktop Manager on your computer.
- Double click on the Backup and Restore icon, then choose Advanced.
- Select all of the databases while holding down the Shift key, and then choose Clear.
- Then choose OK and all databases will be erased.
- Then choose Close.
Good luck