I am working with a 2016 Optima EX the radio needs an update to enable CarPlay as it only has Android Auto. The dealership wants $500 to update the radio which is unacceptable. It has an SD card in the slot. I am trying to figure out how to update it myself but I am not sure exactly how and if it involves a USB drive to the USB port or just the SD card I can't find much online about it. The radio is a model that has factory navigation. Any help is appreciated.