Unplug the TV, insert the USB, plug it back in, and hold the Power button on the TV (not the remote) until a blue "Installing" screen appears .
Copy the firmware file directly to the root directory (not inside a folder) . Triggers: Download 35022441 3840x2160 Kogan part10 rar
Once you have the correct file (usually a .bin or install.img ), use this general procedure to update or "unbrick" the unit: Unplug the TV, insert the USB, plug it