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Level 1

9 points

last Update WIN10 I use with Bootcamp now prevents to start with or switch over to macOS High Sierra

Hi all,

I have a Macbook Pro late 2016 with touchbar. I am using macOs High Sierra and Win10 via Bootcamp. Everything was fine until the last WIN10-Upgrade (KB4048951, 404954 and 4049011). Strating from then WIN10 somehow prevents the Mac from starting in MacOS rather than in WIN10. If I click on the Boot Camp icon and then choose "restart in macOS" an alert window informs that the system can't find the startup volume of macOS.

I asked the Apple Support and after several other tries ,we started the disk repair via cmd+R at start. The system was fond and I could access macOS.

But when I then switched back to WIN10, again WIN10 prevents macOS from starting.

At the end Apple support adviced me to reinstall macOS, what I did this morning.

Again macOS was starting fine, but again switching to WIN10 it prevents to get over to macOS.

I then tried to restore WIN10 to the point previous to the last updates, but nothing changed.

Does anybody have a clue and solution?

Thanks in advance for your suggestions.

MacBook Pro TouchBar and Touch ID, iOS 11.1, using Boot Camp

Posted on Nov 18, 2017 4:47 AM

Best reply

Handrock Author

Level 1

9 points

Posted on Nov 26, 2017 5:24 AM

Problem seams resolved! I don't really know what happened. I was about to start a WIN10 session in order to control the power settings as you suggested and a message popped up saying "disk repairing ...". When this finished, WIN10 started up regularly. When I shut down and restarted the system, macOS started up. I shut down again and then pressed alt/opt at new switch on. Choice between Bootcamp and macOS displayed. Again I chose WIN10 and after start I shut down again. Then switched on with alt/opt pressed and the choice between he two systems displayed! Since one week it didn't work, now, after this "disk repairing" message, everything works properly. Thank you Loner T anyway for your support and advice. It was highly appreciated!!

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