Software for these models is often distributed in split RAR archives because of large file sizes. You must download all parts (Part 1, Part 2, etc.) to successfully extract the usable firmware file.
If the software update fails or the TV is unresponsive, you can try a factory reset by holding the Power button on the TV for 60 seconds.
Installing firmware for the wrong panel resolution or board number can cause "Mirror Image" or display issues. Always verify your board number (e.g., T.R83.03) before flashing.