(Note: The model number is typically , not "lcue630x". This guide applies to the Sharp LCU630X AQUOS 4K Smart TV series.)
Look at the sticker on the back of your TV. You need the full 9-digit model code (e.g., LC-50UE630X , LC-60UE630X ). The screen size (50, 60, 70) matters because firmware is panel-size dependent. sharp lcue630x firmware update full