The latest version is Android 5.0 Lollipop.
How to update your Android smartphone or tablet
As a precautionary measure it’s good practice to back up your data such as contacts and photos. The upgrade should not affect your data but there is no guarantee.
Navigate to the Setting menu of your device. On most Android devices this can be done via the app menu or notification bar. Typically the Setting app will have a cog or spanner logo.
Scroll down the Settings menu and click on ‘About Phone’ or ‘About Tablet’. If you have a tabbed settings menu then this will appear in the ‘general’ section.
The menu can vary slightly from device to device but click the ‘Software Update’ or similar button. This section of the menu will also detail which version of Android your device is running.
Your phone or tablet will now search for an available update. If you are taken to another menu, select the ‘Software update check’ button or similar.
If an update is available your device then you will be asked whether you wish to install it. If you select yes then the system will download and install the new software and reboot.
Note: You device may require a Wi-Fi connection to search for an update. We also recommend downloading the software over Wi-Fi because the file size can be large.