Colleagues, it is obvious that the user has no technical knowledge at all. "Chips" ... oh my gosh ...
First, he needs to learn something about it.

If HU reports an error that Primo.exe is missing, then it is WInCE based unit.
Absolutely detailed instructions exist, here:
[Only registered and activated users can see links. ]

Although, I assume that the device had a launcher that had unified software for GPS, music and other things.
Navigation will probably work without it, but you should definitely contact the manufacturer. Or to the seller from whom it was purchased, even better. He could make copies of the content from another device, upload them and send him a link.