Windows 10 build 9907 (fbl ie)

Windows 10 build 9907 (fbl_ie) is a build of Windows 10. This build is available in the pseudo  locale used to test the localization functionality. It's one of the few builds of Windows known to have pseudo-localization, the other one being Windows 8 build 8331 (fbl_loc).

Timebomb
This build is a test-signed build (not flight-signed), and as a result can be installed on the current date.

Installing this build on the current date will result the wallpaper change to black with gray accent color and a message on the first boot saying: Install a new build of Windows now.

Installation
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.