The command " csmservice -i -a unlabeled -Z UNLOCK -w -o" is not to be used for switching from simplex to duplex.
If you have two controllers and the array is in simplex mode, you need to open CAM and go through Service Advisor. There is a procedure to switch an array from simplex to duplex. The steps include a link which you need to click in order to switch the mode. You also need to use the correct NVSRAM.
Follow the procedure in Service Advisor and if you encounter any issue, feel free to open a SR with the Oracle support after collecting a fresh supportdata from the array.