I've included the steps below if you're unable to see the above link.
Not only is Smart Switch great for transferring data, it's also an easy way to update your device's software. When you open Smart Switch on your Windows PC or Mac, you will see an option to update to a new software version if one is available.
Step 1. Connect your device to your computer using the USB cable provided with your device. Step 2. Open Smart Switch on your PC. Step 3. If a software update is available, Smart Switch will automatically prompt you to update the software or display an option to update. Step 4. Tap Update and follow the on-screen instructions to download the necessary files and complete the update process.