To keep your LG NB4540 Soundbar performing at its best, keeping the firmware up to date is essential for fixing bugs, improving sound stability, and occasionally adding new features. While many newer models use the LG Soundbar app
Alternatively, press and hold the button on the remote for 5–10 seconds. The front LED display will flash the current version (e.g., “SW: 140421” or “VER 0.1.8”). lg soundbar nb4540 software update
and wait for the progress bar to reach 100%. Do not turn off the soundbar or your phone during this process. Manual Update via USB To keep your LG NB4540 Soundbar performing at