Do not turn off the power or remove the USB drive during this process. This can permanently damage the soundbar.
Copy the .bin file onto the root directory of your USB drive. put it in a folder. 4. Perform the Update Turn on your NB4540 soundbar.
The LG Audio Remote (or LG Wi-Fi Speaker) app used to support OTA updates, but LG has since deprecated this for legacy models like the NB4540. Many users report the app says “No update available” even when a USB update exists. Always use the USB method.
However, the journey of an update is not always smooth. The need for these updates often arises from specific functional issues. Owners of the NB4540 have historically sought firmware updates to resolve common pain points, such as intermittent subwoofer disconnections, audio lag when connected via HDMI-ARC, or compatibility glitches with streaming services on connected TVs. For example, an update might patch a bug that causes the soundbar to fail to power on simultaneously with the TV via CEC (Consumer Electronics Control). Without these patches, a premium audio device can quickly become a source of daily frustration. Thus, the software update serves as a vital diagnostic and repair tool that extends the product's useful life beyond its original factory state.
The app will display the current version. If a newer version is available, tap
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.
Your USB drive is likely formatted incorrectly. Ensure it is strictly formatted to FAT32, not NTFS or exFAT. Alternatively, ensure the update files are placed in the main (root) folder of the USB drive and are fully unzipped. Try using a smaller USB drive (e.g., 4GB or 8GB USB 2.0). Update Gets Stuck at a Certain Percentage
While the NB4540 is older, try connecting it to the LG ThinQ app to manage settings, subwoofer levels, and tone control (bass/treble).
Because the LG NB4540 lacks built-in Wi-Fi, you must perform the update manually using a computer and a USB flash drive. Step 1: Download the Official Firmware Go to the official for your region.
The unit should detect the update automatically. The display should show "UPDATE" or "UPG".
If you need help finding the files or checking compatibility, let me know: Which you are connecting the soundbar to The exact firmware version currently displayed on your unit
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:
Open the extracted folder to find the firmware file (usually ending in an extension like .bin , .rom , or .hex ).
