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Not restart, my Mac, please help me


[Edited by Moderator]

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Sierra and High Sierra Recovery have for a long time been buggy on Apple's servers. Below are the workarounds. I'd install High Sierra rather than Sierra if the Mac supports it.


https://mrmacintosh.com/fixed-an-error-occurred-while-preparing-the-installation-macos-sierra-recovery-error/


https://mrmacintosh.com/how-to-fix-the-recovery-server-could-not-be-contacted-error-high-sierra-recovery-is-still-online-but-broken/