Ensure the firmware is for your exact board and panel version, as incorrect firmware can lead to a "bricked" (non-functional) television. To help me narrow down the exact file, could you tell me: What is the Mainboard Model Number (e.g., 40-MS6486...)?
Before downloading, confirm the mainboard number in your TV (e.g., 40-MS6486-MAA2HG). Firmware for the 43S4900 is often listed under the mainboard number rather than the TV model number. Download TCL LED43S4900 Firmware part03 rar
Searching for specific firmware parts like "part03.rar" for the TCL LED43S4900 Ensure the firmware is for your exact board
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. Firmware for the 43S4900 is often listed under