windows 10 pro update insider preview 21390 always fails

Copper Contributor

windows 10 insider preview 21390.1 failed to install on ‎5/‎27/‎2021 - 0xc1900101

I have turned almost everything off  but  nothing changes.  It fails after it has installed the update just as the console comes up.  I have noticed indexing issues with updates before. but even a clean index didn't help.  BTW the troubleshooter on indexes ALWAYS reports them missing which is probably a minor bug somewhere

2 Replies


I've had problems with Update for over 2 months now. It keeps giving me updates but when it tries to install, it doesn't complete the process and just rolls back to the previous version/undoes the installation process.


Build 21390 is the latest Dev build as of this writing, so I would just suggest you to drop a feedback to Windows engineering team via Feedback hub. Your feedback may help the team to fix this problem in next arriving build.

Good luck!