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If you have downloaded firmware as split files (like part01.rar through part06.rar ) from a third-party source:
Release the button when you see an "Upgrading" message or a blinking LED. Do not turn off the power during this process, which usually takes about 4 minutes. TCL LED43S4900 Key Features This model is a Full HD Smart TV launched in 2017. Download TCL LED43S4900 Firmware part06 rar
either through its built-in software or by using a USB drive with the correct files. If you have downloaded firmware as split files (like part01