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0xC1900101 - 0x20017 Fixed!

System: Dell XPS 15 (9530) with Windows 8.1, non-SSD 1TB HD + 32GB SSD

When I tried to upgrade to Windows 10, I constantly got the error:

WE couldn't install Windows 10
We've set your PC back to the way it was right before you started installing Windows 10.

0xC1900101 - 0x20017
The installation failed in the SAFE_OS phase with an error during BOOT operation

Fix: images from this thread

I struggled with this all last night and I hope somebody will not have to go through the same frustrating experience as me!

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