Windows 8 build 8305 (fbl grfx dev1)

Windows 8 build 8305 (fbl grfx dev1) is a build of Windows 8. This build was leaked on 2019-12-31. This build includes new SKUs such as "Professional", "ProfessionalWMC", "Core", "CoreSingleLanguage" and "CoreCountrySpecific". All of these SKUs have the brand new Microsoft Confidential banner in winver, except for Prerelease (Consumer Preview). This build has a broken CoreCountrySpecific SKU, it crashes with a MUI_NO_VALID_SYSTEM_LANGUAGE BSOD during the installation.