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Apr 28, 2016 8:13 AM in response to yese12by Ingo2711,If you tried all these steps, and you still can't update, contact Apple Support or an Apple Authorized Service Provider.
copied from: Get help with iOS update and restore errors
Here's what to check:
- Make sure that you have the latest version of iTunes.
- Check for issues with third-party security software.
- Make sure that your USB cable, computer, and network are reliable. Then try twice more to restore your iPhone, iPad, or iPod.
- If you still see the error message, you can check for outdated or modified software or contact Apple support