Smart-STB offers seamless and automatic updates, so, no more out-dated Set-top boxes. Are you getting a black screen after 'Loading Portal' ? Here are some solutions: This is an application that can simulate your provider's STB - no extra hardware required! smart-stb. after installing the stb emulator app, follow these steps below. Restart your portal URL your AVOV should work without any issue. Smart stb your stb is blocked smart stb your stb is blocked Select Profile Settings 9.