It seems Primo has a strange problem: when a route set, when entering a tunnel, Primo crashes and the GPS device restarts.
Especially Chinese WinCE 5.0 and 6.0 devices, with original 480x272 data.zip, with modified 320x240 and 400x240 data.zip, all are suffering. So all data.zip files are involved.
I can not confirm this because I have no Chinese device. Also, when road testing Primo, I did not pass a tunnel yet. I never even taken ...