How can I fix this issue

Update it from a computer or the Software Update function in Settings, or contact Apple Support.

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What was the result when you followed the guidance in the Related Article above your name on this page, that you were reading just before you posted here? If the Related Article doesn't answer your question please post back with more details about the issue and another user in this user-to-user forum will try to help.

Note that if the troubleshooting steps in the article do not resolve the problem you need to contact Apple support about a hardware repair.