Newer versions require spoofing a newer YouTube API version, which can lead to "sign-in errors." Version 617740 uses an older but fully supported API, so your Google login works every time.
When users search for "smart youtube tv apk 617740 best," they are typically looking for a specific legacy build: .
Enter the code (Stable) or 79015 (Beta) to download the latest SmartTube APK directly.
Once you install version 617740, you will notice immediate improvements: