Windows 10 build 9906

Windows 10 build 9906 is a build of Windows 10, which was shared online 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 border color error
If window auto-colorization is enabled, the window thumbnail borders on the taskbar do not change color even after the wallpaper changes. This issue can be remedied by manually changing the window color through the Control Panel or restarting Windows.