I just wanted to be clear that your internet security is in your own hands once you put the ISP modem into bridge mode. What is the make and model of the modem?
When I got the Vodafone fibre modem almost three years ago the bridge function was hidden but after a lot of feedback from customers they issued a firmware update which enabled the function. What the ISP won't do is provide any support once you put the device into bridged mode as all the routing etc. is your responsibility.