how do you downgrade the xbox dashboard when it has already got xbox live on it?
You must add a download of the older version through telnet. Explained here: Software Method HOWTO Comment: The dirty little secret that’s not mentioned on this site (at least that I could find) is that downgrading the XBox dashboard is like having a drink of water from the Holy Grail — the procedure is trivially simple but FINDING an older dashboard to install is next to impossible.