you can sum it up:
if content/ does not contain a *.dem file, then there is no 3D view.
DEM is a very memory-intensive file and can slow down weak WinCE PNA. Only the Basemap.fbl should be included and only the country map that you need, and no modified branding.zip. Then Primo 2.0 will also run on PNA - even previously installed on many PNAs from China....