Kyocera DuraForce Pro - Manual (Page 220)

Personal Settings 210
3. Tap ERASE EVERYTHING.
 Your phone will power down and reset itself, which may take up to 10 minutes.
 Once the phone has reset, it will run through the Hands Free Activation and update
processes again. When finished, you will see the TalkBack screen and Setup application.
See
Complete the Setup Screens to start over.
Warning: Deleted data CANNOT be retrieved.