You can reset the phone from the Android interface while using Factory Reset or using the buttons available on the phone. That process is called hard reset.
- Using the options in Android
From any Home screen, tap the All apps icon.
Scroll to the 'PERSONAL' heading, then tap Backup & reset.
Tap Factory data reset.
If your phone is password protected, you'll be prompted to enter your Pattern, PIN, or Password.
Tap RESET PHONE
- Using the physical buttons.