LG no longer pushes over-the-air updates for the NB4540. You must perform a manual update via USB. Here’s how to get the file:
: Enhances the pairing speed and range for mobile devices. lg soundbar nb4540 software update
The NB4540 is picky about USB drives. Follow these rules strictly: LG no longer pushes over-the-air updates for the NB4540
: Unplug the soundbar from the power outlet for at least 60 seconds, then plug it back in. stray signals from other remotes
The culprit turned out to be a software logic error regarding the remote sensor. The NB4540 was programmed to be highly receptive to IR (Infrared) signals. However, the initial firmware was too sensitive. It was misinterpreting ambient light, stray signals from other remotes, or even its own internal electronic noise as commands from a user.
