Miracast to 4K TV

I want to use Miracast to extend my display to a 4K TV. Unfortunately, it seems to be limited to 1080p and 30hz. I have read the Miracast is supposed to do 4K but am running into difficulties enabling that for my TV. I am trying to pair with my Sharp 4K LC-50LBU591C TV. Any ideas for solutions?

I don’t know how to at the moment but I can try it with my V on my TV.
How can you tell which resolution you are using for Miracast?

You would right click on your desktop and select display settings as you would with a second monitor. Then make sure the correct monitor in the illustration is selected and scroll down to the resolution drop down box to check the options you have.