Do not use this method if your soundbar frequently disconnects from Bluetooth. A failed app update can brick the device.
If you encounter the dreaded "NO USB" or "ERROR" message, don’t panic—reformat your drive and try a different USB port (the NB4540 has only one, but sometimes re-seating helps).
Keeping the firmware updated on your LG NB4540 is not just about new features—it’s about stability, compatibility with new TV models, and fixing known bugs.
