Because hardware versions can vary, you must match the software to your specific TV's . Common board numbers for this series often include prefixes like TP.VST59 or similar.
If you can tell me the (found printed on the green circuit board inside), I can help you find the exact file you need.
If the TV is working but needs a reset or adjustment, you can often access the (Factory Mode) to fix picture issues or perform a reset without downloading new software: