Windows 8.1 build 9478

Windows 8.1 build 9478 is an unleaked build of Windows 8.1. It is known that this build exists only in the ARM architecture. One screenshot was found on the Chinese website BetaWorld. They may have this build, but this cannot yet be confirmed or deprecated as it is not publicly available. Russian website PC Portal also showed a screenshot with the tag of this build. It remains unleaked as of 2021.