Windows 8.1 build 9477 (fbl partner out21)

Windows 8.1 build 9477 (fbl_partner_out21) is an unleaked build of Windows 8.1. This build is an earlier compile of build 9477. It is known that this build exists only in the ARM architecture. One screenshot was found on the Chinese website BetaWorld. This build is currently only available to select BetaWorld members. They may have this build, but at the moment this cannot yet be confirmed or deprecated as it is not publicly available. As of 2021, it remains unleaked.