If your soundbar does not have internet connectivity, you can update it via USB:
Download the Latest Software:
Prepare a USB Drive:
Transfer the Update File:
Update Your Soundbar:
Even with perfect steps, you may hit a snag. Here are fixes for the most frequent problems:
A: No. The NB4540 does not have built-in Wi-Fi – only Bluetooth and wired connections. USB is the only reliable method. lg soundbar nb4540 software update
A: No. That message means your current version equals or exceeds the USB file’s version.
The LG NB4540 is a 4.1-channel, 360W sound bar known for its wireless subwoofer and rear speakers, delivering a robust home theater experience. However, like any smart audio device, its performance—specifically regarding HDMI ARC handshakes, optical input lag, wireless connectivity, and DSP (Digital Signal Processing) presets—can degrade or glitch without current firmware. The display will show a countdown or "Updating
LG does not release frequent updates for the NB4540 (manufactured circa 2014–2016), but specific updates exist to fix Bluetooth pairing drops, volume control synchronization, and audio codec support. Here is the definitive method to check, download, and install an update.
