How to Update Your Android OS
The interface may change from brand to brand, but overall, the steps should work on pretty much all Android devices.
Step 1. Launch the Settings app on your Android device.
Step 2. Scroll down to look for “About phone” or similar and click on it.
Step 3. Now, you will find an option as “System Updates” / “Software Update“. Just tap on it. Now, it will probably search for an available Android update for your device or would present you with more options.
Step 4. If you find more options after clicking on “System Updates” or similar, you need to click on “Check for updates now” / “Software update check” or a similar button which would start searching for an update for the device.