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What does Error Code 4000 mean I need to do?

When downloading an IOS update on October 4, 2017, my iPhone (connected to PC) gave a message that the update could not be completed due to an Error Code 4000.  What does that mean and how do I correct the problem?

Thank you,

Skip R. 

最後更新：2017-10-04 22:57:08

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