Why is my control unit extension module not recognized?

1. Your control unit extension module must have firmware version 4.1.193 or higher to be recognized. If this is not the case, the firmware version can be updated automatically overnight. To do this, leave the ekey control unit DRM online overnight.
2. Make sure that you have connected a maximum of two control unit extension modules to the right-hand side of the ekey control unit DRM.
3. Check whether the ekey bionyx system has been disconnected from the power supply before plugging in the control unit extension module.
4. Check whether the EXTENSION LINK has been plugged in.