Plug the USB into the TV. A pop-up should appear stating "USB update ready"; select Install . Method 2: Network Update (Automatic) LG 55UH850V.AEK Product Support: Manuals, Warranty & More
This is the standard way to update if your TV is not connected to the internet. Download 55UH850V Software rar
Create a folder named exactly LG_DTV in the root directory of the USB drive. Plug the USB into the TV
Visit the official LG Support Page and search for your model (55UH850V). Prepare USB: Format a USB drive to FAT32 . Download 55UH850V Software rar