I have a new 7200NEX and want to take advantage of the free one-time map update. My model is not supported by the Naviextras Toolbox, so I tried to use the AVICSYNC app on my iPhone. I was able to download the updated map to the phone via WiFi, but can't get it to transfer to the head unit. I am using a USB connection. The app has trouble 'associating the phone', and when it does often loses the connection. I finally got the app to begin the transfer to the head unit and said it would take 1 1/2 hours. The app kept losing connection and quitting on me. Any ideas?

I will probably just use CarPlay anyway but wanted to at least get what I paid for!