With the help from Keith I found: SW 1.1
As found out by the help of Millemissen: my Beo 4 is a very old version, that does not have the more recent LIST functions. Anyway, it does a good job to turn on RADIO on the bathroom’s BeoLab 3500.
For more functions I have to find a newer Beo4. What version do I have to look for to get N-Radio, N-Music ?
Thank you all for the friendly support!