In Roku's website, Roku 4 specification shows "Up-scales 720p to 1080p HD on 1080p HD and 4K UHD TVs". What Does it mean?
Does it mean it can convert 720p video into 1080p?
Yea it does, it provides the best quality possible, but in order to watch 4K, source has to be 4K, second if you have not bought it yet, I don't recommend you do, I've had nothing but problems with my Roku 4. I'm on my second unit and I wish I could return it for a refund.