In fact, I would agree that the first version of Primo's are best for these navigation. My device is like that (7 years old. WinCE 5, 64MB, 372MHz). After much experimenting a lot, I stayed at KIA version (v.2.0, 9.6.5.306142) with just a few modifications. Having read comments on various forums, many argue that TTS Pro versions working on it.
[Only registered and activated users can see links. ], try it, just add the necessary files (global_cfg, maps, pois, etc)...