HT204204: Update the iOS software on your iPhone, iPad, or iPod touch
Learn about Update the iOS software on your iPhone, iPad, or iPod touch
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Helpful answers
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Feb 14, 2016 4:58 AM in response to andreafromyucca valleyby Ingo2711,Sorry, but you'll need a computer to do that, there is no other way. Visit an Apple Store or Apple Authorized Service Provider and ask them to do that for you.
Or maybe some of your friends can help you out.
If you can't unlock the restrictions, you'll have to start from the scratch, the code for restrictions is part of your backup and will be restored if you use that backup again.
Use iTunes to restore your iOS device to factory settings - Apple Support