Windows 10 build 9901

Windows 10 build 9901 is a build of Windows 10, which was leaked on 14 December 2014. It is very similar to build 9900.

UEFI BIOS
This build can only be installed on machines utilizing UEFI firmware since it hangs on a BIOS system.

Window thumbnail color error
Window thumbnails on the taskbar do not change color, but the user can change it after the computer restarts.