Use a utility like WinRAR or 7-Zip to extract part1.rar . This will automatically combine all parts into a single folder containing a .bin or .img file.
Move the extracted firmware file to the root directory of the USB drive (do not put it in a folder). Installation: Turn off the TV and unplug it from the power source. Insert the USB drive into the TV's USB port. Download 35018484 3840x2160 Nikai UHD55SLED3D part1 rar
Press and hold the on the TV (not the remote) and plug the TV back in. Use a utility like WinRAR or 7-Zip to extract part1
The TV should detect the file and begin a software installation or upgrade process. Download 35018484 3840x2160 Nikai UHD55SLED3D part1 rar
Typically equipped with stereo speakers and Dolby Atmos support on newer variants. How to Use the Firmware