Soundbar Nb4540 Software Update | Lg

Important Pre-Update Notice

Before proceeding, please note the following critical points:

Method 2: Automatic Update (For Models with Network Features)

If your NB4540 is connected to your home network, it may update automatically.

  1. Connect the Soundbar to your Wi-Fi or wired network.
  2. If an update is available, a pop-up may appear on your TV (if connected via HDMI ARC) or the Soundbar display may indicate an update.
  3. Select "Yes" or "OK" to proceed.

Note: The NB4540 is an older model, so the server support for "Push" updates may have been discontinued. Method 1 (USB) is highly recommended.

LG NB4540 Sound Bar: A Complete Guide to Software Updates

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. lg soundbar nb4540 software update

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.

Step-by-Step Guide: LG Soundbar NB4540 Software Update

Model: LG NB4540 (2.1 Channel 300W Sound Bar with Wireless Subwoofer)

If you own the LG NB4540 soundbar, you know it packs a punch for its size. However, to keep it running smoothly—fixing Bluetooth dropouts, HDMI-ARC glitches, or general audio sync issues—you need to keep the firmware up to date. Do not disconnect power: If the power is

Unlike modern smart soundbars that update via Wi-Fi, the NB4540 requires a manual update using a USB drive. Don’t worry; it’s easier than it sounds.

Here is the official method to update your LG NB4540.

Pro Tips to Maintain Performance Post-Update

  1. Use an HDMI ARC cable – For best results, connect the NB4540 to your TV’s HDMI ARC port using a high-speed HDMI cable (not optical). Update often improves ARC stability.
  2. Adjust digital audio output on your TV – Set TV to “Pass-through” or “Bitstream” – not PCM – to let the soundbar decode Dolby Digital.
  3. Re-run the Auto Volume or Night Mode – Updates sometimes reset these audio processing features.
  4. Keep the USB drive – Store the firmware file on a dedicated drive labeled “NB4540” in case you ever need to reflash.

Step 5: Finalize and Verify

  1. When complete, the display will show END or COMPLETE.
  2. Unplug the sound bar from power again.
  3. Remove the USB drive.
  4. Wait 30 seconds, then plug back in and power on.
  5. Repeat the mute-button test from Step 1. The MAIN version should now reflect the new number (e.g., 150114).

Final Verdict

Don't expect magical new features like Dolby Atmos (this is an older 2.1 bar). However, a USB update usually fixes: Method 2: Automatic Update (For Models with Network

Warning: Do not turn off the power while "UPDATE" is on the screen. This can brick your soundbar.

Having trouble finding the file on LG’s website? Check the "Manuals & Downloads" section for the NB4540. If only Windows drivers appear, run the .exe file—it simply writes the firmware to your USB.

Last Updated: 2024-2025 (Check LG.com for current files).

Step 3: Prepare the USB Drive

  1. Insert your USB drive into your computer.
  2. Copy the extracted firmware file into the root directory (the main folder) of the USB drive. Do not place it inside another folder.
    • The file name usually looks like LG_NB4540_Vxxxx.bin.