While rarely used for this model due to its age, manual updates can sometimes be performed if a file is provided by LG Support. Use a USB drive formatted to FAT16 or FAT32 .
Before jumping into the process, let’s understand why an update matters. Over the years, LG has released several firmware patches for the NB4540 (released around 2015-2016). These updates address: lg soundbar nb4540 software update
: If an update fails or freezes mid-way through, pull the power cable on the soundbar, wait 30 seconds, plug it back in, and try again. While rarely used for this model due to
If the app does not work, you can perform a manual update using a USB flash drive. LG NB4540 Product Support: Manuals, Warranty & More wait 30 seconds