Many users are seeing the « 0xc1900101 » error code when trying to upgrade to Windows 11 24H2 or those testing it. Microsoft has explained how to fix it.sort of.
A few days ago, a Neowin reader xillibit posted a query on our forum since they were curious to know why they were getting a 0xc1900101 error when trying to update to Windows 11 24H2. This caught our attention and we wondered if more people were getting this error.
Turns out, the 0xc1900101 error seems to be pretty widespread,with various users experiencing the issue all throughout 24H2 Insider testing as well as final release.
In fact, the bug popped up in the very first version 24H2 Insider build itself back in February earlier this year with build 26052. And it has done so time and again, with more recent incidents surfacing back in September, though Microsoft again confirmed it has been fixed earlier this month in build 27718. It wrote:
Fixed an issue which was causing some Insiders to experience a hang at the boot screen and their PC to roll back with error 0xC1900101 when trying to upgrade to the previous flight.
