I understand my 920 is running version 5, which I'm thinking is the firmware version of the 940. I completely understand hardware didn't get upgraded to a 940. Does that mean I don't need to go to 5.1 before ordering / installing the 2017 maps? I'm happy with the way the unit is working if it doesn't need anything more than to install the latest maps that's great, if it's going to lose some functionality then I'll install whatever it needs.