A well-known resource for LED TV software often hosts TP.VST59S.PC815 firmware files .
Use a FAT32 formatted USB drive (ideally 4GB or 8GB).
Firmware for this board is typically distributed via technician forums and specialized electronic support sites.
Extract the .rar file and copy the .bin firmware file to the USB root directory. Insert & Power: Plug the USB into the TV while it is off.