Microsoft has released an “unintentional” update to Windows 10 and versions of its mobile OS. The builds were only released to those on its Insider Program, so retail users shouldn’t be affected.

“This happened because an inadvertent deployment to the engineering system that controls which builds/which rings to push out to insiders,” said Dona Sarkar, software engineer for the Windows and devices group, in a blog post. “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.” 

However, Microsoft admitted that it will cause problems if installed. “Please be aware that this build was never intended to go out to Windows Insiders and may include issues that impact usability of your PC – more so than the normal builds we give you,” Sarkar said. 

To roll back if you have installed it, go to Settings, and then Update & Security, and then Recovery. Act quickly, as you only have ten days for a clean rollback.

On mobile, the build won’t install, but may leave you stuck in a reboot loop. You’ll need to use the Windows Device Recovery tool and re-flash it. If it’s yet to attempt to install – you’ll see an “install” or “restart now” button – you’ll need to do a device reset. Microsoft advises backing your phone or device first. 

Again, the builds were only offered to those on Windows Insider, not on standard retail versions of the OS. 

“We apologise for this inconvenience and thank you for being a Windows Insider,” Sakar added. “We will keep you updated on when we plan to release new builds to you next week. We will not be releasing new builds to any of the rings this week.”

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