You need to find a trusted repository hosting SmartTube_v6.17.740.apk . (Note: The project is often open-source under names like "SmartTubeNext," but version 6.17 740 is a legacy build). Use a search engine to locate a mirror.
One of the most requested features missing from the stock YouTube TV app is background audio. With version 6.17 740, users can minimize the app or turn off the TV screen while continuing to listen to podcasts, music videos, or documentaries. This is a game-changer for users who treat YouTube as a music streaming service. Smart Youtube Tv 6.17 740
Disclaimer: This guide is for educational purposes. Installing modified APKs may violate YouTube's Terms of Service. Downloading APKs from third-party sources carries inherent security risks. You need to find a trusted repository hosting SmartTube_v6