Microsoft has apologised for accidentally releasing builds from some of its internal branches for PC and mobile that were rolled out due to the “inadvertent deployment” to the engineering system that controls the release of builds to the Windows Insiders.

Microsoft was forced to apologise late on Friday night after some confidential and internal Windows 10 builds were leaked and it has now rectified the issue to ensure these development builds do not reach more people, Dona Sarkar, Microsoft’s head of its Windows Insiders programme, wrote in a blog post.

“We apologise for this inconvenience and thank you for being a Windows Insider,” Sarkar added, saying Microsoft will not release any new builds this week.

The Windows Insider by Microsoft is a programme that allows users who own a valid Windows 10 license to sign up for early builds of the operating system previously only accessible to developers.

The term build refers to the process by which source code is converted into a stand-alone form that can be run on a computer.

Microsoft said although it has put blocks in place to check the dissemination of the build, a “small portion” of Windows 10 users still received them.

What is worrisome is that Windows 10 testers who installed the mobile build, had their phones into a reboot loop which led the devices to crash.

To come out of this problem, testers will have to recover and wipe the device using the Windows Device Recovery Tool.

Meanwhile, Windows 10 testers who installed the PC build will have to wait for Microsoft to publish a newer build or roll back using the recovery option in Windows 10 settings.