Xbox One OS

Xbox One OS is a firmware (variant of Windows Core OS) developed by Microsoft to run on the original Xbox One console, which was released to Xbox One Consoles in 22 November 2013 along with Xbox One Console Itself. Versions before 2014 are based on the Windows 8/8.1 codebase, whereas later versions are based off of the Windows 10 and Windows 11 codebases.