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.
Websites like Remont-Aud.net or 4PDA often host split RAR firmware files for TCL models. You will need to search for "TCL LED43S4900 firmware" or "MS6486" (the common mainboard chassis for this model) to find all parts (Part 1, Part 2, Part 3, etc.) in the same thread. Download TCL LED43S4900 Firmware part03 rar
(often S4900 series, FHD) usually requires accessing specialized firmware repositories rather than official TCL support pages, as these are older models. These archives are typically split
Here are the proper steps and resources to locate this firmware file: You will need to search for "TCL LED43S4900
Are you getting an or is it completely stuck on the logo ?