Restoring your device to default settings helps when the device crashes and resets itself or when apps freeze/hang or reset the device.
Performing these steps resets all system settings (e.g. ringtones, sound settings, display settings, etc.) back to their default values. Personal data, such as downloaded apps and media (pictures, videos, music), aren't affected.
From a Home screen, navigate: Apps > Settings > Backup and reset (Personal section).
These instructions apply to Standard mode only.
From the Reset section, tap Reset settings.
Review the info then tap RESET SETTINGS.
If presented, enter the current PIN, password, or pattern.
Review the info then tap RESET SETTINGS to confirm.