Can;t Find Settings for AX5400 with MR1100 Nighthawk

[AXRouterGuy1234]

Hello, amazing people! I am reaching out and hoping you can help. 

I am new to setting up Orbi's. We have the MR1100 Nighthawk by Netgear with ATT. However, every time I try to set up the AP settings it completely errors out and I have to do resets on both Orbi and Router.  Every time I used the AP version, and even try to change the IP Address, it errors out completely and becomes inaccessible. It doesn't seem to like it. (Tried this about 15 different times - maybe more!) . And then, when I use it as a router, I can't seem to get it past 60/11 (download/upload). I also can't seem to find a beamforming option. 

Any help and advice would be amazing! - Thank you in advance!

[CrimpOn]

The equipment description is a bit confusing.  The Nighthawk MR1100 is a mobile LTE device:

https://www.netgear.com/images/datasheet/mobile/MR1100_100NAS.pdf 

Perhaps it is being used as the Internet connection for an Orbi WiFi system?  AX5400 is "Marketing Speak" for some imaginary number that comes from adding up several theoretical bandwidth numbers.  What is useful is to know the specific model of Orbi that can be found on the product label on the bottom of the router.

Generally speaking, it is usually a good procedure to get the LTE device working first, before attempting to add the Orbi system.