Since I am from India, I selected Asia & Pacific > India, for instance. Select your region and country on the page and then click on the Support tab.
Prerequisites: The size of a webOS firmware may range from 400MB to 1GB depending on the software version and LG Smart TV model. If your LG TV is unable to check for updates, you can go ahead and download the latest firmware update for your TV and install it via a USB storage device.