Here are the proper steps and resources to locate this firmware file:
These archives are typically split. You must download all parts (e.g., part01.rar, part02.rar, part03.rar) and place them in the same folder, then extract only the first part using tools like WinRAR or 7-Zip. Download TCL LED43S4900 Firmware part03 rar
Searching for specific firmware parts like "part03.rar" for the TCL LED43S4900 Here are the proper steps and resources to