If the update stops around 19%, it often means the software on the board is already the same version as the one on the USB drive. Flashing T.VST59.031 LCD controller board firmware
Use a program like WinRAR or 7-Zip to extract the .bin file from the .rar archive.
Do not turn off the power until the LED stops flashing or starts blinking very rapidly.
Once finished, remove the USB drive and restart the TV. Troubleshooting
Format a USB flash drive to FAT32 and copy the .bin file into the root directory (not inside any folder). Update the Board: Insert the USB drive into the TV board's USB port.

