Newer software improves the "LG Sound Sync" feature and stabilizes mobile pairing. ⚡ Power Management
Updating the typically involves using a specialized mobile application or a manual USB process if a specific firmware file is provided by support. While current support pages for the NB4540 often state that "No softwares available for download" , LG provides universal methods for their legacy audio equipment. Method 1: Using the LG Soundbar App (Recommended) lg soundbar nb4540 software update
If the display remains completely frozen for more than 15 minutes, unplug the power cord, wait 30 seconds, plug it back in, and try the process again with a different USB drive. The Wireless Subwoofer Disconnected After the Update Newer software improves the "LG Sound Sync" feature
Locate the downloaded ZIP file on your computer and extract its contents. Method 1: Using the LG Soundbar App (Recommended)