Ensure the firmware you download matches your Panel Number and Main Board Number , not just the model name, to avoid bricking the TV. Toshiba TV: How to Update
If you are missing "part4.rar," you must ensure you have all other parts (part1, part2, and part3) from the same source , as different versions or regions will not be compatible when you try to extract them. How to Install Once Downloaded Download TOSHIBA 40L5400ZE Firmware part4 rar
Once you have all parts (including part4), right-click "part1.rar" and select "Extract Here." This will automatically combine all parts into a single .bin or .pkg file. Ensure the firmware you download matches your Panel
Press the Home button, navigate to Settings > System > Software Upgrade , and select Scan for update . Press the Home button, navigate to Settings >
Sites like Dr-Bios or GsmForum often host "bin" files and split firmware archives for repair technicians. You can check for model-specific threads on Dr-Bios .