If the image appears distorted after flashing, you may have used a 1080p firmware version instead of the required 3840x2160 build.
Completely unplug your Aconatic TV from the power source. Download MS638 PC822 3840x2160 Aconatic 49DSU800 part1 rar
If the TV doesn't recognize the update, try a different USB port or ensure the drive is formatted correctly to FAT32. If the image appears distorted after flashing, you