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 .
Press the Home button, navigate to Settings > System > Software Upgrade , and select Scan for update . Download TOSHIBA 40L5400ZE Firmware part4 rar
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 Sites like Dr-Bios or GsmForum often host "bin"
Turn off the TV, plug in the USB, and turn the TV back on. Some models will auto-detect the update. not just the model name