If you have downloaded firmware as split files (like part01.rar through part06.rar ) from a third-party source:
Connect your TV to Wi-Fi, then navigate to Settings > Device Preferences > About > System Update > Network Update . Download TCL LED43S4900 Firmware part06 rar
Plug the drive into the USB port on the back or side of the TV. If you have downloaded firmware as split files (like part01
The safest way to update is through the TV's menu or official support channels: typically ending in .pkg
Right-click part01.rar and select "Extract Here" using a tool like WinRAR or 7-Zip . This will automatically combine all parts into a single firmware file, typically ending in .pkg , .img , or .bin .