I’m having the same problem.
I received a brand new 3.0 controller and 3 expansion boards.
The main controller is working like a charm. I tested two different expansion board, each one with different expansion cables, without success.
The indexes of expansion boards are on OFF and OFF, like it is explained on https://rayshobby.net/docs/os30_starter_guide.pdf
I restart the controller but the new zones dont appear.
Any idea ? Is there any software configuration to do ?
Have a nice day.