Search for the VST26 12C 11331 file here.
Ensure the firmware file is in the "root" directory (not inside a folder) of the USB drive. Flash the TV: Turn off the TV and unplug it from the wall. Insert the USB drive into the TV's USB port. Download VST26 12C 11331 Boda STYLANCE LED2303 rar
If you are looking for specific drivers for other hardware, communities like the V1E Forum offer general advice on flashing various controller boards and firmware updates. Search for the VST26 12C 11331 file here