It includes a fix for a Wi-Fi vulnerability (CVE-2017-6975) which affected the above devices, and could allow an attacker to execute arbitrary code on the Wi-Fi chip. You should be able to see the iOS 10.3.1 update in Settings.
To download the update, ensure that you have good Wi-Fi strength, and your device is charged up to 50 percent at least. Don’t forget to backup your iOS device before you download and install the update.
To download and install it directly on your iOS device, go to Settings > General > Software Update, and tap Download and Install.
When the download is complete, tap Install and tap Agree when Apple shows you its Terms and Conditions. Your device will the restart and install the update.
To download iOS 10 via iTunes, first install iTunes, open it, and then connect your iOS device to your PC or Mac.
In iTunes select your device’s icon on the top bar, click the Summary tab and then click Check for update.
Now, click Download and update. At this point, you should follow the simple on-screen instructions to install iOS 10.
“iOS 10.3.1 introduces new features including the ability to locate AirPods using Find My iPhone and more ways to use Siri with payment, ride booking and carmaker apps,” the update reads. Apple Security updates page lists that iOS 10.3.1 is available for iPhone 5 and later, iPad 4th generation and later as well as iPod touch 6th generation and later.
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