the physical power button on the TV (not the remote).
Finding the exact .rar file usually involves one of these sources: Download TCL LED48D2740 Software rar
the TV while still holding the button for about 10 seconds. An "Upgrading" notice should appear on the screen. ⚠️ Important Precautions How to Perform a Manual Update on TCL Google TV's the physical power button on the TV (not the remote)
The best first step is to visit the TCL Support Page and enter your model number. If it isn't listed, contact their after-sales team directly; they often email specific firmware files upon request. contact their after-sales team directly