We want to make sure you are having the best device experience, Nilena! Are you trying to update over the air on the device or connected to iTunes?
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Nilena, thanks for the information! Do you have a computer? What error does it give you when you try to do over the air? You can also try to update if via computer see here: http://support.apple.com/en-us/HT4623. Let me know if their is anything else I can help you with.
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