If you have got any notifications for update then Select Yes and download the software ,proceed to installation.
But if you have not received a notification message for this update, follow the steps below to manually update your phone:
- Select the Settings icon in the apps menu.
- Select "About phone".
- Select "System updates".
- Select "Yes, I’m in". After the software is downloaded, select "Install now".
- After the software is installed, your phone will re-start automatically.
Note : After upgrade a downgrade to lower version is not possible !
Find latest features in upgrade here :