Not sure I understand the question. Generally speaking, when you change routers, you would follow the instructions in the new router - installation instructions FAQ.

Not sure StarLink matters, Sonos doesn’t know where the internet data is coming from, only that it’s there or not. 

Thanks Bruce. I open the S1 app and I get the S2 upgrade pop up. I had all of my older devices working on bell. Replaced with StarLink. Do I need to reconnect speakers and amp to bell then move? 

Edit

Try to set up the S1 system without the S2 system being on.

I’d agree. Sometimes, systems seem to get ‘confused’ when there are two versions present. Unplug/ power down all of you S2 devices temporarily, and do what you need to with S1. Once you’re done, plug in the S2 devices again.

And yes, plug at least one S1 device into the StarLink router until such time as you’re done messing around, it just is easier. There’s no need, however, to bring back up the Bell router.