Enter your and download the update.roku file to a USB drive. Updating TCL Mobile Devices
TCL provides several ways to access firmware updates depending on your region and platform. Software Upgrade - TCL Download Tcl Firmware For All Models
The safest place to get firmware is directly from the manufacturer. Visit the TCL Support Page . Enter your model number in the search bar. Enter your and download the update
Insert the USB drive containing the raw firmware file into the TV. Visit the TCL Support Page
TCL televisions are highly sensitive to USB drive configurations. Failure to prepare the drive correctly will result in a "Verification Failed" error.
TCL has become one of the largest TV manufacturers in the world. Whether you are looking to fix a bug, downgrade from a problematic update, or enable features not available in your region, finding the right firmware is essential.
XDA Developers TCL Forum (Trusted for custom or older stock firmware)