How do you block iRobot OTA firmware updates?

Since I suspect that the last firmware update installed on my Roomba 980 has broken integration via the iRobot binding, I’d like to prevent any future upgrades, in the hope that the binding will be updated at some point.

I’ve heard it mentioned that you should use the parental controls setting in the router, but which URL should be blocked? Is there a specific firmware URL that can be blocked without affecting the iRobot app when on wifi?