Turn off WiFi on T-Mobile Home Gateway

Oof. This is disappointing. I was excited to try this out - my ISP has gotten worse and worse. From the research I had done, it looked like it would have been possible to disable wifi on the gateway and just hook up my existing mesh system.

I got the tower today and immediately noticed how limited the options are. I was hoping to come here and find a secret menu like a few other people mentioned.

I know that a lot of the responses to this are "why would you want to disable the wifi?" That's a good question, so I'll break it down for myself:

• I have an existing mesh system that I paid decent money for pretty recently. I'd like to keep that.
• I have a number of existing wifi devices that I don't want to program a new network onto. (Yes, I know I could set the new gateway to match the SSID and password, but still.)
• I have a lot of smart devices on Zigbee, which generally uses the same spectrum as wifi. I just got them to play nice with my mesh network, and I don't want to be forced to mess with it again. Interference is real!
• The security/prioritization/device management options for the gateway/router are extremely limited compared to my current system. (Or even the one I had before it.)

Side note - I had read that the gateway would have a battery, allowing me to easily test it in multiple locations. I guess not?

I hope that a firmware update for the gateway could fix a lot of this. The way it stands, though, I'll have to be blown away by the speeds if I'm gonna keep this service. Has anyone been successful in exchanging the gateway for something with a little better customization?