Windows 8.1 build 9477 (fbl partner out21)

Windows 8.1 build 9477 (fbl_partner_out21.130803-1037) 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. This build is only available to BetaWorld members. They may have this build, but this cannot yet be confirmed or deprecated as it is not publicly available.