Microsoft broke a number of Windows 10 smartphones yesterday by pushing out a buggy release of the OS.
The internal build of Windows 10 was accidentally sent to people signed up to test early releases of the OS under the Windows Insider program.
However the version released yesterday, Build 16212, was not ready for public use, and Dona Sarkar, head of the Windows Insider Program at Microsoft, put out a warning not to install the release.
#WindowsInsiders: pls do not install any builds being offered til you hear from us with a blog post. If you have installed, reset with WDRT.
— Dona Sarkar (@donasarkar) June 1, 2017
Any mobile users who installed the buggy build found their device stuck in an endless reboot loop.
Microsoft has since blocked the release from being pushed to any more Insiders, and Sarkar said only a limited group among the millions of Windows Insiders were affected.
"Our analysis shows only a small portion of folks got these builds," she said.
Mobile users who installed the unstable release on their phones have to use the Windows Device Recovery Tool and reflash their device to get it working again. If they so wish, they will need to rejoin the Windows Insider Program again after flashing their device.
If a mobile device has downloaded the build but not installed it, users will see an 'Install' or 'Restart now' button under Phone update. In this instance, users need to reset the device via Settings -> System -> About. Microsoft advises first backing up the device via Settings -> Update & security -> Backup.
The pre-release version of Windows 10 was also pushed out to Windows Insiders on PCs and while not breaking devices may be more unstable than typical Insider builds of Windows 10, according to Sarkar. PC users can roll-back to the previous build via Settings -> Update & security -> Recovery.
The release doesn't affect Windows 10 users beyond those signed up to the Insider Program. Last year there were numerous complaints about bugs introduced by the Anniversary Update, however this year's Creators Update seems to have caused fewer issues.
Read more on Windows 10...
- Windows 10: The smart person's guide
- Windows 10: The 10 biggest controversies and surprises in 2016
- Windows 10 Cloud: Could this mystery OS be Microsoft's answer to Chromebooks?
- Windows 10: Microsoft promises updates will soon be smaller and easier to delay
- Windows 10: Ten missing and highly anticipated features due in 2017
- Windows 10 Anniversary Update: Watch out for these nasty surprise
Nick Heath is chief reporter for TechRepublic. He writes about the technology that IT decision makers need to know about, and the latest happenings in the European tech scene.