UPDATE: Microsoft has now publicly addressed this issue. See the addition at the end of the post. –Paul
If you’re a Windows Insider, be careful not to install any new builds today: An internal mishap at Microsoft has triggered an errant release.
Dona Sarkar has addressed this issue on Twitter:
Windows Insiders: pls do not install any builds being offered til you hear from us with a blog post. If you have installed, reset with WDRT [Windows Device Recovery Tool].
It’s not clear what happened yet, but it appears that Windows Insiders with Windows phones were offered an internal build of the system that is not actually designed for phone. This build was pushed to all Windows Insider rings—Fast, Slow, and Release Preview—and apparently even went out to the production channel as well.
The enthusiast community reacted with the usual grace.
Holy fuck the boot loop build is being pushed to PRODUCTION on Mobile too. NORMAL PEOPLE are receiving this broken build.
Zack, Zack. Normal people don’t use Windows phones. Come on.
Or, as Rafael noted:
LIVE at Microsoft
The bigger issue, of course, is that build 16203 went out to some PCs as well. And that is not OK. Normal people do use PCs.
Just kidding. But you get the idea: Be careful.
In a post to the Windows Experience Blog last night, Microsoft’s Dona Sarkar addressed what she called the “unintentional” release of insider builds.
“Builds from some of our internal branches were accidentally released for PC and Mobile,” she explains. “This happened because an inadvertent deployment to the engineering system that controls which builds/which rings to push out to insiders. The team was quick to revert the deployment and put blocks in place to stop these builds from going out to more people. Our analysis shows only a small portion of folks got these builds.”
Of course, if you did install one of your builds, you’re going to want to know what to do.
On PC, you should be OK: The unintentional build was an internal build, and it may be less stable than previous builds, but—who knows—it may also reveal some new Fall Creators Update features. On phone, you’re in the trouble (for more than the usual reasons), and you will need to reset your device with the WDRT. Ms. Sarkar’s post explains this.
Regardless, there will be no more (official) Windows 10 Insider Preview builds this week, Microsoft says.