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my mac book pro does not update to mac OS Sierr...

my mac book pro does not update to mac OS Sierra, Version 10.12.6. from 10.12.5.  It freezes during the boot process. And I need to reinstall the latest back up to get it going again.

Some one knows what couldbe done?



最後更新:2017-09-05 11:31:39

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