. For this specific model, updates are typically delivered via Bluetooth through your smartphone rather than direct USB manual downloads. How to Update Your LG NB4540
LG NB4540 (2.1 Channel 300W Sound Bar with Wireless Subwoofer) lg soundbar nb4540 software update
If you did it right, the display would flash a cryptic sequence of lights. If you did it wrong—say, the file was in a folder—the soundbar would brick itself. . For this specific model