Windows 10 build 9906

Windows 10 build 9906 is a build of Windows 10, which was leaked on 29 January 2015. It is very similar to build 9903, and as such, does not feature many changes other than bug fixes.

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.