Hi there, i am in desparate need of help for my tcl 75c4us tv. It has just stopped working and only turns on as far as the logo screen. I am sure i need a firware update as far as i have been told but i cant find a place to download it for my model. Can anyone tell me where i can download this system update or even the roku number so i can try to get it from the usa tcl site. Prefer the system update file though. But would also be happy if anyone knows the roku number