It was not an easy way to watch television channels on Jio Fiber STB, definitely it can't match with the Tata Play viewing and usable experience. Some channels will open in an different app other than the Jio Tv+ app and changing the channel will be pain. Also quality of the channels will not match with the Tata Play.
I have 30mbps Plan and I was able to stream 4K WPL without any issues, but I have less than 5 devices connected to the Router at a time.
