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If your phone gets slow or doesn't work as it usually does, it may help to restore the factory default settings. All settings and configurations you've made on your phone are deleted.
1. Find "Security Wipe"
Slide your finger downwards starting from the top of the screen.
Press Privacy and Security.
Press Security Wipe.
2. Restore factory default settings
Press the text input field and key in blackberry.
Press Delete Data. Wait while your phone restores the factory default settings. Follow the instructions on the screen to set up your phone and prepare it for use.