GuideIssuesUpgrade Windows to a later version Windows 10 to 11 Update Failed - 0xc1900101 - 0x20017 Updated September 08 2024
"We couldn't install Windows 11
We've set your PC back to the way it was right before you started installing Windows 11.
0xc1900101 - 0x20017
The installation failed in the SAFE_OS phase with an error during BOOT operations.

Results online indicate you should remove AV software, ensure drivers and firmware are updated, sfc /scannow, etc. I did all those first, they did not fix it, however the steps below did.

I was able to fix this by doing two things (not sure which fixed it since I did both at the same time)
1: Recreated EFI partition
https://helpfultechnotes.com/guide/321

2: Rebuilt Recovery partition.
https://helpfultechnotes.com/guide/266






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