XPS 12 9Q33 - Windows 10 Anniversary Update hangs on upgrade
I previously upgraded from Windows 8.1 to 10, but the Anniversary Update will not complete properly and I've been stuck on v1511 for a few months now.
The installation goes through most of the steps but on reboot it just goes to a black screen with the dell logo and the endless spinning dots. The error message after rolling back is: 0xC1900101 - 0x30017 ("The installation failed in the FIRST_BOOT phase with an error during BOOT operation".
I've tried the following based on other forum posts, unfortunately without success:
1) Leaving this running overnight.
2) Unplugging all USB devices.
3) Installing upgrade from USB drive.
4) Installing from a clean boot.
5) Installing with wireless adaptor disabled.
In each case it hangs at the spinning dots. After a few forced reboots the upgrade rolls back fairly quickly to the previous version. One thing I haven't tried is a clean install, as if it fails I'll not have anything to roll back to. Also it's unclear if my existing Windows 10 license will carry over.