Pez

I would like to update the firmware on my appradio. It is currently the 8.05 and I want to load the 8.05 US version so I can use pandora. Problem is, I can't even get the 'update firmware' button to activate? It just stays grey all the time. I have the parking brake bypass so don't think that is the problem. I have tried with bluetooth and all devices connected as well as disconnected, not change. Any ideas?