Once you have downloaded the .rar file, follow these typical steps for updating via USB:
The software is a firmware package typically used to resolve issues like the TV being stuck on a logo, hanging, or failing to start. Finding this software generally requires matching the LCD/LED panel number or motherboard (mainboard) number to ensure compatibility. Where to Find the Software
Plug the power back in. Some models require you to hold the button on the TV panel while plugging it in to trigger the update.
Installing the wrong firmware version (mismatched board number) can permanently "brick" your TV. Always verify the board number inside the TV before flashing. EcoStar LED TV All Software Collection Free Download