Hope that some guru will find an answer to my long-standing problem ;)
Device is Mio moov 330, on which I installed Igo Primo 2.0, instead of default Miomap. Simplest possible installation in which I directed mioautorun file to load primo instead of default software. It works without hesitation. Internal memory of device is 1 GB and, as you are aware, definitely not enough if you want to use all benefits Primo can offer. So ...