: If your model has smart features, you may be able to update via Settings > Device Preferences > About > System Update if the TV is connected to the internet.
Wait for the progress bar to reach 100%. The TV will usually restart automatically. Download TCL LED40D2939 Firmware part2 rar
Right-click part1.rar and select "Extract Here" using a tool like WinRAR or 7-Zip. This will automatically pull data from part2 to create the full firmware file. : : If your model has smart features, you
Place both part1.rar and part2.rar in the same folder on your computer. Right-click part1
Copy the extracted firmware file (usually named V8-xxxxxx.bin or MstarUpgrade.bin ) directly to the root directory of the USB—do not put it inside a folder. : Turn off the TV and unplug the power cord. Insert the USB drive into the TV's USB port. Press and hold the Power button on the TV (not the remote).