You must extract the .rar file using a tool like WinRAR or 7-Zip to find the actual firmware file, which usually has a .bin or .img extension. Installation Guide
The file contains the binary firmware ("dump") for a specific TCL television motherboard, the TP.U63.PB772 , typically found in 32-inch models like the TCL 32 D310 Download U63 PB772 1366x768 TCL DUMP rar
Copy the extracted .bin or .img file to the of your USB drive (do not put it in a folder). Plug the USB into the TV's USB port. You must extract the