As having many experiences with a really lot of different Mio devices, this is the only model which I fail to make run Primo on it. Playing with the sys, cutting unnecessary files to make program lighter to work etc...spent whole afternoon without a success. Big frustration. I believe that device registry could be some how "protected" or blocking Primo to run. But at in this case than maybe also iGO8 wouldn't run I think. Who knows, maybe somebody will figure it out or get a "lucky strike"