: Since you have "part03," you must download all other parts (e.g., part01, part02) into the same folder before extracting with WinRAR or 7-Zip .
" refers to a specific firmware part for a television mainboard, specifically the HK.T.RT2841P638
Plug the TV back in. Many models will start the update automatically; others may require holding the physical button on the TV while plugging it in. HK.T.RT2841P638 USB Firmware Software Bios Bin