Look at the back of your TV for the model number (e.g., JTC Atlantic, Genesis, or a series of numbers). Visit the Official Support Page: Jay-tech Support Portal Search by Model:
Most JTC TVs are configured to check for updates automatically when connected to the internet. However, automatic updates sometimes fail due to: jtc tv software update download
JTC is often an OEM (Original Equipment Manufacturer). They buy motherboards from major Chinese manufacturers. The firmware is tied to the board, not the brand. Open the back of your TV (or search online forums for your TV's teardown) and look for the mainboard sticker. Common board manufacturers for JTC: Look at the back of your TV for the model number (e