Haha! Maybe not even 'mortared', just 'dry laid' [Only registered and activated users can see links. Click Here To Register...] Certainly the firmware for both devices was the same up to V3.50, both zumo 660 and Motorrad Nav IV V3.50 GCD files have MD5 hash of 5D718929FD7DB084D55839299ED03A9B. However, later versions haven't been issued for the Motorrad that I'm aware of only for the zumo up to V5.10 so perhaps there's something in the later versions stopping them being effective in the Motorrad. If he can't re-flash the latest version we'll need a good coder to have a close look (hint, hint).