There is no default password, you choose the root password during setup.
But where did you find those passwords?
https://www.youtube.com/watch?v=gqMW0NeODAQ
For this to work, the Bunny must act as a Ethernet adapter. Use ATTACKMODE and then what ever you need.
https://wiki.bashbunny.com/#!payload_development.md
I recommend reading the wiki and watching the intro video before asking on the forum.
Is it that hard to post the URL to the product page?
Anyway if you phone connects to the light with the app, maybe try and MITM your phone and the light and then use TCPDump, or try reverse engineer the app.
TCPDump, Dwall, SSLSplit, Ettercap, anything that can view traffic i guess
But are you sure the nano connects to the light bulb and not the other way around?
could you grab the windows license and clean install windows?
There is a tool called magical jelly bean that should do the trick, or maybe the license is on a sticker?
https://www.magicaljellybean.com/keyfinder/