@FireFox58
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It seems there is a bug in Zumo firmware since sw. 3.60, fixed in 3.70, but every time Zumo updates maps with Express it loses curvy roads feature you'll need to manually restore the firmware after each LifeTime map update
Additionally:
Go to apps - trip planner and select a previously created route. Press the icon at top left and a screen opens with list of options, including choice of fastest, shortest or off road .
Select second option, which is off road, press save, and that option will now display in screen as curvy roads. It does select a different route from fastest route.
Select 3rd option, shortest distance, save and it shows as off road!
Spoiler: source
http://advrider.com/forums/showpost.php?p=22952003&postcount=190