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Today, the long-waited macOS high Sierra was finally arrived. I can’t help trying it after downloading it for several hours. But out of my expectation, the updating is stuck during the process of rebooting system. The a big file folder appeared at the center of the dark screen(see attached pictures). It popped out every 2 seconds. Very annoying!

I tried to turn off my MacBook Pro (Retina, 13-inch, Early 2015) and the problem persisted. How should I do it?

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  • Did you try recovery mode? – Tetsujin Jun 30 '17 at 11:09
  • How to do it? Thanks – wayne Jun 30 '17 at 11:10
  • Cmd/R or Cmd/opt/R at the boot chimes. I'm guessing the first won't work, or it would have gone to the built-in recovery automatically, if it could find it - so it looks like the 2nd one, Internet Recovery might be your only option. – Tetsujin Jun 30 '17 at 11:12
  • It won’t work. I tired both – wayne Jun 30 '17 at 11:20
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    Then you need a USB or an external HD/SSD you can boot from, or take it to an Apple Store. Your Time Machine drive ought to be bootable. – Tetsujin Jun 30 '17 at 11:32

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