Hello, I’m Nathan, and I’ll be assisting you today.
Sorry to hear that you’re having trouble with this but I’ll do my best to help you out.
Regardless of the model of your tv, the "realvision" content is not going to be available on the tv as a direct app.
There is not really any "usb" function that would change that.
What you can do however is pick up a streaming device such as a chromecast: https://www.google.com.au/intl/en/chromecast/
This simply plugs into a hdmi port on the back/side of the tv (and to power), and then links up to your home wifi network.
You find the content you want on your pc or laptop, or on a smartphone/tablet, using the google chrome web browser or a dedicated tablet app, and then you can "cast" the content over to the tv from there via your homes wifi network.
So long as you have a good internet connection at home, there won't be buffering.
If you have any other questions, just let me know. Otherwise, please take a moment to rate my service using the stars at the top of the page; hopefully I have earned 5 Stars. I also invite you to contact me directly with any future support needs at http://bit.ly/1QwLxGh and ask for Nathan.
Thank you, ***** ***** a nice day,