Multi-part RAR (ensure you have all parts, including part03 , before extracting) How to Install CV338H-A42 Firmware via USB

Once the light stops flickering or the TV reboots, remove the USB drive and check your system settings. Service Menu Tips

Move the extracted file to the root directory of your USB drive. Do not put it inside any folders, or the TV won't recognize it. Flashing Process: Turn off the TV and unplug the power cord. Insert the USB drive into one of the TV's USB ports.