Welcome to the forum and thanks for reaching out! The article that @Carl linked is a fantastic starting point, if you have any specific questions or issues you run into along the way, just let us know and we can help, thank you!
I had already read this. I could not find the new Nucleus One to do the updates and prepare it for the backup transfer. I was able to use the router to open it and perform the updates to the OS. I could then see it on the Roon app on the tablet to switch servers.