Since the WAAS satelite changes in July I upgraded the Envizio to the lastest firmware version but not the reciever.  Since I started running the system this fall I have not been able to get differential correction once.  Is my Phoenix 200 reciever in need of a firmware upgrade?  I can get the latest version free online but what cable do I need to upload it to the reciever with a PC?  It's not possible to update the reciever through the USB port on the Envizio is it? 

 Thanks,