I've checked the model of this TV and it appears that it has been discontinued. I tried to locate the firmware for this model, but the page with the files leads to a 404 page. Therefore, the only way to obtain support for this inquiry is through the Live Chat form available on their website.
Access the following link and add the details you need then wait for their response. Also, keep in mind that the chat is available only for a certain time. A pop-up should provide the necessary information about this.