Q: Windows 10 upgrade fail 80073B92-20009 Fusion Drive iMac

iMac 27inch Late 2013

fusion Drive

OS X 10.10.4

bootcamp partition with Windows 8.1 installed ok

the Windows 10 upgrade is ready to install however it fails every time at the reboot stage. I get error 80073B92-20009 and the upgrade fails the iMac starts up in Windows 8.1 again

The installation failed in SAFE_OS phase with an error PREPARE_ROLLBACK operation

iMac (27-inch, Late 2013), OS X Yosemite (10.10.4), Fusion Drive

Posted on Aug 8, 2015 12:02 AM

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by Quai007,

Quai007 Oct 4, 2015 12:22 AM in response to kar_kct
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Oct 4, 2015 12:22 AM in response to kar_kct

head to this page:
https://discussions.apple.com/thread/6812673
read note by ridhoyp, was able to get bluetooth working again using this driver. Was able to initially pair keyboard and it connected but wouldn't type. Disconnected and then re-paired and bingo, bluetooth keyboard works! I can't comment on a bluetooth mouse as I use a USB wireless mouse. Good luck!
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by Macs Pain,

Macs Pain Dec 5, 2015 3:58 AM in response to britops
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Dec 5, 2015 3:58 AM in response to britops

Same problem now with the latest big update of Windows 10.
Microsoft just plain *****.
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Q: Windows 10 upgrade fail 80073B92-20009 Fusion Drive iMac

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by Quai007,

by Macs Pain,

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