Installing the correct navigation map

NOTE: TECHNICAL INFORMATION
Install the correct navigation map depending on the validity of the customer subscription after having replaced the head unit.

Different cases:
Customer subscription is still valid:
- Install the most recent navigation map.
  Customer subscription has expired:
- Check when the customer subscription expired*.
- Install the navigation map applicable on the expiry date.
Customer subscription has expired. After the expiry of his/her subscription, the customer purchased a newer version of the navigation map ("One Time Update"):
- Check which navigation map was installed most recently*.
- Install this navigation map.