401      iPhone_iPad_Mac_apple

my serial is unvailable after updating my os

Do you see it at  menu/About This Mac? If you go to About This Mac and click System Report, is it there?

As per this article :Find the model name and serial number of your Mac - Apple Support

If you see an About This Mac window like the following, double-click the version number beneath “OS X” to reveal the serial number.

最後更新：2017-08-18 01:14:36

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