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Level 1

9 points

Option Startup not working since upgrading to High Sierra

I have a 2017 iMac with an internal SSD. I have Bootcamp Windows 10 on an external USB 3 SSD. On OS X Sierra, I would Option-Startup and select the EFI drive and boot into Windows 10. I just upgraded the iMac to High Sierra and Option-Startup no longer works. No boot drive selection is displayed.

Posted on Dec 15, 2017 7:16 AM

13 replies

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