If your TV isn't picking up the update over Wi-Fi (or doesn't have it), you'll need to do a manual "USB update". LG 42LN540V - 42" LED TV - Currys Business
Official downloads are usually provided as .zip files. If you find a .rar file on a third-party forum, make sure to scan it for viruses before opening it. Key Specifications for 42LN540V Download 42LN540V Software rar
While many sites offer firmware downloads in .rar or .zip formats, the safest place is always the official manufacturer's website. For the , you can find official firmware on the LG Support Page . If your TV isn't picking up the update