Good morning Neil, (at least here)
the weather here is really miserable right now, its raining cats and dogs. So I didn't have chance to try it yet. Achko on the boote.de forum wrote to me, that I have to propably downgrade first to v 3.40 and then go back to v 3.80. We will see what happend. But since the unit is instaled in my boat, I have to wait till the rain stops pooring. I will wrote the results asap.
Regards
alex