Reset your smartphone to the original factory settings
You'll need to reset your smartphone to the original factory settings to fix this problem.
CAUTION: This should only be done as a last resort. Resetting your smartphone deletes your ringtones, contacts, pictures, messages, and other downloaded content. Before you continue, make sure to back up your smartphone.
- From the Home screen, tap Apps.
- Tap All.
- Tap Settings.
- Select Storage.
- Select Factory data reset.
- Tap Reset phone.
- Tap Erase everything.
The smartphone is reset to the original factory settings.