Why U9-H do not support my 3840x2160 TV?

It only show 1080P,720P.....,my TV is Panasoinic,it support RGW 3840x2160 @30hz .But U9-H can not show it and 4K. How can I get the video output 4K@30hz or 3840x2160 @30hz? Thank you!
It is last firmware.And how to change hdmi input, is it change TV hdmi input? I can not change TV hdmi input.When TV connect my notebook,the TV can display at 3840x2160 @30hz .Thank you!
You can change your tv hdmi in (in the back of your tv) , put the cable in other hdmi in . And then is just with your remote control change the hdmi inut.