Samsung Galaxy J3 V / J3 (2016) - Reset All Settings
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) are not affected.
From a Home screen, navigate: Apps > Settings > Backup and reset.
These instructions apply to Standard mode only.
Tap Reset settings.
Review the disclaimer then tap RESET SETTINGS.
Tap RESET to confirm.
If applicable, enter the PIN, password or pattern.