The version 6.17.391 of Smart YouTube TV (an unofficial client by yuliskov) is an older release from June 2020. While it is still available for download, much newer versions and alternative "extra quality" apps now exist for modern Smart TVs and Android TV boxes. Version 6.17.391 Download
If you still encounter performance problems, contact YouTube Help via your phone or computer. Never, ever sideload an APK from a random website onto your television. The version 6
Troubleshooting common issues
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Smart YouTube TV 6.17.391 (noarch) (Android 4.0+) - APKMirror and I’ll produce a detailed