Can't change password to access modem and router

Hi, this is very frustrating as I can't even accomplish the most simple things during setup. This never happened on my personal modem and router. Just the Xfi gateway I'm forced to rent.

I logged into 10.0.0.1 with default username and password.

It prompts me to change my password.

Modem restarts, and the browser page times out during the restart process.

I try to change it again and I keep getting the same same "timed out" message.

I closed out and went back to 10.0.0.1. Still uses the same default username/password.

Try to change it again, times out.

Wifi works since I set it up through the app, but the app doesn't let you change any settings or even set up the 5g access point.

This entire setup has been a nightmare. IT'S 2024!!!