Insert the USB into the powered-off TV. Press and hold the power button while plugging it in until the update progress bar appears on the screen.
Download all archive parts. Right-click "part1" and select "Extract Here" using WinRAR or 7-Zip to merge all parts (including part3) into the final firmware file [User Query]. Insert the USB into the powered-off TV
Installing the wrong firmware version (e.g., mismatching FHD vs. HD resolution) can lead to a "blank screen" or "upside-down image". Insert the USB into the powered-off TV