Sometimes opening up everything is not necessary.
I had to repair my Qubino devices recently and could just delete the device using the settings -> zwave -> remove device and then triple-click the switch as I recall correctly.
After that it can be reincluded the same way (triple-click the wall-switch).
Yes you need to bring homey real close to the switch, I did that using a powerbank capable of delivering 2.1A on one of its ports.
