I repeated the GarminCure3 procedure, only this time, I selected CURE instead of ORIGINAL and flashed the software. Making progress here, because now the unit does get one step beyond the Garmin splash screen: it now shows an image of a white house with a double window, metal fence in front and some red flowers on the side:
Probably a result of having flashed the cure firmware. Also, when now connecting the unit to the PC, an empty Windows Explorer window pops up of the nüvi. No files or folders shown at all (yet, show hidden files and folders as well as show operating system files is selected).
The nüvi is formatted FAT32. Properties are as follows
WebUpdater is not recognizing the nüvi yet. Now reading the tutorials section for next steps.