Home Ownership Change // Update email to new owner?

[HalpMePlz]

My girlfriend recently bought a Lennar home in Utah from a previous owner, so the "smarthome" database is probably linked to the former owners address. The internet was working for a while but just recently everything seemed to failover to a "restore.meXXXX" status or something. We tried power cycling all the things. Then hard resetting all the things. Nothing seems to have brought us back online. I can't seem to http into the web console for the switch (ICX- 715c12p), and when we're doing a traditional setup through the phone app, all the U::P comboes we've tried have failed for the switch  access, even after a hard reset.

A: Anyone know how to get that updated for all things Lennar? (but specifically at least for ruckus wireless in this case?
B. Do I have to whip out my old windows 10 laptop and plug it directly into the switch and configure it, and even if I do, will it work with the downstream? 
C. ALL of the ethernet cables into the switch are blue. None of them are labeled as "FIBER" or "ATT" or "MAIN" or anything. What's the easiest way for me to check which one comes from the main feed?