If your TV is not connected to the internet, you can download official packages from the TCL Support Page by entering your model number. The update file should be placed on a USB drive and installed via the System Update menu or by holding the power button while plugging in the TV. Finding the "Part 10" File
Firmware split into 10 or more parts is typically found on enthusiast forums or unofficial repositories like or sites like XDA Developers . If you must use these unofficial sources:
Ensure the firmware matches your TV’s Project ID (found in the Contact Us section of your TV's settings).
What is your (found on the back sticker or in settings)?