Do not use version 6.17.740 or 6.17.617 — they are obsolete.
Instead, install the latest SmartTube (current active project) from its official GitHub:
https://github.com/yuliskov/SmartTube
The modern version has better performance, more features, and works with current YouTube APIs. smart youtube tv 617 740
Note: This works easily on Android TV (Sony, Philips, Nvidia Shield) but is trickier on Samsung/LG. Do not use version 6
Sometimes, Google updates the YouTube backend API, but your TV manufacturer (Samsung, LG, etc.) is slow to release the corresponding app update. The old app tries to speak a new language to the server, and the server responds with error 617 740. Note: This works easily on Android TV (Sony,
Some users on fiber optic connections report that IPv6 routing conflicts cause error 740.
This solves the problem in roughly 60% of cases.
You won't find this on the Google Play Store. To get Smart YouTube TV 6.17.740 on your device: