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MacBook Air frozen latest Sierra Update

My MacBook Air has stalled on the latest Sierra update. It gets to a certain point in the update, black line progress bar, stops and goes no further.

I have started it in safe mode and the same happens, got to disk utility and repaired same again and also tried command +R on start up.

Is there anything else I can try thanks.

最后更新：2017-08-19 19:17:07

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