ARRIS Group, Inc. TG4482A - Bridge Mode Issues, Really Weird Issues

Hi all, I received the new 1.2Gbps ARRIS modem yesterday and figured it would be an easy swap with my previous one. It was anything but. I have the ARRIS and an ORBI router that's right next to it, so I unplugged the cables from the Orbi and old modem and reattached everything to the new modem. I rebooted both of them at least 5 times and weird things are still happening.

1. Do I stay away from the ARRIS LAN port with the red stripe on it? I originally connected the Orbi (Internet port) to this port on the ARRIS, but Orbi wouldn't work. I couldn't find any instructions on the purpose of the red stripe port.

2. I got Orbi working by using another LAN port on the ARRIS, but BOTH wifis are actively working in disabled bridge mode. If I enable bridge mode, Orbi stops working.

I don't understand why turning on bridge mode disables the attached Orbi, so right now I am in disabled bridge but both the Orbi and ARRIS are communicating their WiFi names. My wireless printer stopped working (it was connected to the Orbi) and only worked if I connected it to the ARRIS wifi. All of my other 10+ devices are connected to the Orbi wifi with no issues.

I hope this makes sense. I also can't access the ARRIS anymore at 10.0.0.1 (refused to connect). Thank you!