Install the latest version of iTunes.
Force your device to restart: press and hold both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple logo.
Connect your device to your computer using a USB cable.
When iTunes asks you to update or restore, click Update (not Restore) to reinstall iOS and keep your personal data.
Done
If that doesn't fix it use a different lightning cable. That error is caused by a hardware fault. Normally a bad cable, a full storage iPad or a wifi drop.
Last edited by Kavy; 08-22-2017 at 09:40 PM.
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Your tears fuel me