Locate the downloaded ZIP file and extract (unzip) its contents.
To update the software on your LG NB4540 soundbar, you can use the official mobile application or a manual USB method. Firmware updates are essential for resolving sound quality issues, fixing software "glitches," and occasionally adding new features webOS Forums Method 1: Using the LG Soundbar App (Recommended)
The shown on the soundbar display when you plug in the USB? Share public link
This is the safest and most reliable method. LG’s official support website hosts the file.
Remember: firmware updates fix bugs; they do not transform hardware. Your NB4540 will never support Dolby Atmos or eARC, but a successful update will make it stable enough to serve as a reliable TV speaker for years to come. lg soundbar nb4540 software update
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
When complete, the soundbar will and return to the last used input (e.g., “OPTICAL” or “HDMI”).
Open your web browser and navigate to the official .
Firmware installations can sometimes take up to 10 minutes. Locate the downloaded ZIP file and extract (unzip)
Absolutely. Even though the LG NB4540 is nearly a decade old, the final firmware release significantly improves stability. If you’ve never performed an , you are likely missing critical fixes for HDMI handshakes and subwoofer pairing. The process is free, requires only a USB stick, and takes less than 10 minutes.
With the USB drive ready, follow this sequence precisely:
Use a standard USB 2.0 or USB 3.0 drive with a capacity under 32GB.
:
Remove the USB drive after the soundbar successfully reboots to its normal operational display. Troubleshooting Common Update Issues
If you are troubleshooting and need to verify your version, you can generally do so through a manual button sequence on the unit: Set the soundbar to (even if no USB is inserted).
Fixes audio dropouts and handshaking issues when connected to modern eARC/ARC TV ports.
Most modern devices update over Wi-Fi. Not the NB4540. To fix the ghost, you had to go old school. LG posted a .zip file on their obscure support page. The instructions were a rite of passage for the tech-savvy: Share public link This is the safest and