Another SmartNave issue 2019 Pete 567

2019 Pete 567 Heritage with SmartNav. I have a unit that the SmartNav went out. Once I got the truck back, I had replaced the SmartNav DEA601 display. Of course the driver had to leave so I never got it working. While he was out, he cut the radio harness and put his own aftermarket radio in. He no longer works with us. Now I had to replace the head unit and the harness to get it back to factory spec. Here is my issue: The old SmartNav went blank, so I replaced it (a few months ago), I just replaced the missing head unit and damaged harness. When I key on the truck, I get the Pete logo with nice white background, then it goes dark and all I have are the 3 nav options at the bottom. Return, home and 3 dots. How do I reprogram/update this system? Thank you all for helping