Reset my Modem to defaults and now cant enter bridge mode.

Have had my xfinity owned modem in bridge mode for 5+ years and today  my personal router crpped out on me so I decided to reset modem and use the built in router for now until i buy new personal router. After resetting the modem i had to go through a whole new setup process and even download an app called xFi to set it up. Now i cannot access 10.0.0.1 admin access to enter bridge mode anymore. Theres not even an option in xFi to enter bridge mode. How do i enter bridge mode?