I dont know if this has been talked about, but I was browsing through the Lexus Enform site and notice a "Multimedia System Update" section. My excitement when I know I could skip a 2 hour service at the dealership. I downloaded the file which was about 80+ MB, wipe my usb stick and move download file to the stick. I pop the memory stick in and everything install. It took about 15 minutes. My Nav software updated to V15A8872 and OS updated to 16.8700. I save time from the dealership. This was done on a 2015 model.