To learn more, visit Apple Support: Update the iOS software on your iPhone, iPad, or iPod touch. Tap Software Update, then Download and Install. Plug your device in to power and connect to Wi-Fi. Next, view the Previous updates section for details about the most recent software installed on your device. If your device isn’t eligible for the latest update, follow the steps to update and verify the latest software available for your device. How to back up your iPhone, iPad, and iPod touch. Update your iPhone, iPad, or iPod touch. 
If you enter your Apple ID and password and still can’t sign in, visit Apple Support: Find My iPhone Activation Lock.
After you update, you might see the Activation Lock screen on your iPhone or iPad. Although there should be no impacts to settings or data, we recommend that your device is backed up to iCloud or iTunes before updating. We recommend connecting to Wi-Fi ® before downloading the update.
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