While specific procedures can vary, most VST26-based boards follow this "USB Auto-Update" method:
Plug the TV back in. Some models require you to hold the button while plugging it in. Download VST26 12C 11331 Boda STYLANCE LED2303 rar
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. While specific procedures can vary, most VST26-based boards