Installing the wrong firmware version can "brick" your TV or cause the screen to display upside down or with distorted colors. Always verify that your board model and panel resolution match the file exactly.
Firmware for these boards is often hosted on community forums or specialized technician sites. Because the file you're looking for is a "part3.rar," you must download (usually part1, part2, and part3) and keep them in the same folder to extract the final .bin file correctly.
The standby light should begin flashing, indicating the update is in progress. until it finishes.