If you accidentally installed the of YouTube instead of the Android TV version , your remote will not work (the screen will look like a vertical phone screen).
The simplest method is to do nothing. Ensure your TV is connected to stable Wi-Fi and that automatic updates are enabled: Smart Tv Youtube 6.17 391 Download Latest
No. Samsung uses Tizen OS. The versioning system is completely different (e.g., YouTube for Tizen is usually version 2.x or 3.x). You cannot install Android APKs on Tizen. If you accidentally installed the of YouTube instead