Installing firmware that doesn't exactly match your TV's panel model can lead to a "black screen," inverted colors, or a "bricked" motherboard that will not boot.
.rar is a compressed archive format. The "part1" designation indicates a multi-part archive , meaning you must download all parts (part1, part2, etc.) and keep them in the same folder to successfully extract the single large firmware file inside. Critical Safety Precautions
To help you find the correct instructions or the remaining parts, could you share: