In case of Z21 control system, please utilise the information provided on the Z21 website www.z21.eu.
You can find the most important links here:

Z21, the systematic control centre: https://www.z21.eu/en/z21-system/general-information

Z21, the different versions: https://www.z21.eu/en/z21-system/the-models

Z21 App, driving experience of a new generation: https://www.z21.eu/en/products/z21-app

z21start enable code: https://www.z21.eu/en/products/z21start-unlock-code