Because this specific model (40L5400ZE) is part of an older series, official downloads may no longer be listed on the main Toshiba support site. You can typically find these files through the following community-driven platforms:
Turn off the TV, plug in the USB, and turn the TV back on. Some models will auto-detect the update. Download TOSHIBA 40L5400ZE Firmware part4 rar
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 Because this specific model (40L5400ZE) is part of
Specialized channels such as lcd tv led tv smart tv software frequently upload multi-part firmware files for specific motherboard numbers (e.g., MSD638 or similar). If you are missing "part4
If the TV is stuck on a logo or "boot loop," you may need to hold a specific physical button (like Power or Volume Down) while plugging in the power cord to trigger a forced USB flash.