To reset a BlackBerry smartphone to factory defaults perform the following steps:

Warning: This will erase all data from the smartphone, please ensure that you back up the BlackBerry smartphone first.

1. Connect the BlackBerry smartphone to the computer.
   
2. Open Start > Programs > Accessories > Command Prompt.
   
3. Type cd C:\Program Files\Common Files\Research In Motion\Apploader
   
4. Type loader.exe /resettofactory

Note: BlackBerry Desktop Manager 4.7 must be installed on the computer.  The BlackBerry smartphone must be running BlackBerry Device Software versions 4.3 to 4.5.