Hi,
I have the exact same problem with my TV & got the same answers from Hisense and Roku, with each blaming the other. I have this nice 58" TV sitting in a box now. Ended up spending DAYS trying to fix it, hours on the phone & after a very PO'ed wife, I bought a Vizio 55" to replace it. Hisense boxed. Is there ANYONE out there that can guide me to a download of the entire ROKU OS for install?? Already tried the USB route with update.roku file. TV is currently junk now but would really like to use rather than throw away. We'll install the Vizio in the bedroom. HELP plz!!!