Thanks for reaching out. Please take note that although there are TV brands that can be set up for Chromecast with Google TV however, not pairable/compatible with the Voice Remote.
As a workaround, you may try to choose a different brand from the list, which in your view has the same country of manufacture as the TV. You may also search for TV remote codes online and see if any other brand matches the same code as DGTEC, and select that other brand instead. However, please be informed that this step may or may not work.
Just one quick final check in here since activity has slowed down. We haven't heard from you in a while so we'll be locking this thread if there is no update after 24 hours. If you have any new questions, updates or just a discussion topic, feel free to start a new thread in the Community.