My bad experience with official radars on Via.

OK, I've done a bit more research. The issue is due to having an expired safety camera subscription. The old .dct remains on the system and it prevents the cameras from working. These need to be deleted so it can be re-activated using the built-in keygen - unfortunately these are stored inside the internal memory so it's not easy to access. I will see if a special *.ttpkg can be created to erase these.