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     The easiest way to update your Android OS it OTA update. This is really simple and safe. Just go to settings in Android smartphone then find system update option. Actually this option locked in different areas in different smartphone. In many smartphones this option locked on about phone option.

   All of you can see this option in your smartphones. This is one of the important option of smartphones. Backup and reset will let you clear all your data of your smartphone like Installed App, Games, videos, MP3 songs, all types of files. But this option can't delete default apps of your smartphones. When you click this option it also let you log out from your Google account.