No WiFi calling on Zyxel c3000z

I am trying to get my iPhones (one iPhone 12 and one iPhone 13) to connect to my ATT wireless via WiFi Calling. I have done all of the troubleshooting steps on the phone side of things. And, in fact, I can get both phones to do WiFi calling on a friend's Xfinity router. But when I come home, I can't get phones to connect to WiFi. I have tried both the 2.4 mhz and 5 mhz bands on my network. Is there something else I need to set up in the router's settings?

I saw in some other postings the recommendation to update the firmware in the c3000z. But I can't get the .bin file to open on my Mac. If updating the firmware is required, how do I do it on a Mac platform?

Thanks.

Jeff

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