I’d note that (outside of Comcast possibly being mad at you breaking the modem), sometimes they push a bad update and you need to reset the modem, and last time

I’d note that (outside of Comcast possibly being mad at you breaking the modem), sometimes they push a bad update and you need to reset the modem, and last time I did that I needed to step through the initial setup on the WiFi network before activating bridge mode. So if the wifi hardware is broken you might need to jump through hoops to get through that setup (or swap the modem).