Wow, this is really tricky. I sort of figured it out, and successfully loaded the older firmware, but it did flash back to the newest version. I'll follow your new instructions and let you now how it goes. Thanks!

Success! We'll see how useful the unit is now with this old firmware. It's back to interacting with Basecamp. That is one issue resolved. The other is the matter of the unit hiding waypoints it is not navigating to, not much of an issue for most, but a real problem for me, as I do a lot of off-roading in extremely remote terrain, and tend to follow waypoints I've loaded from Basecamp like breadcrumbs.

Thanks again, you've been a terrific help.