It is standard WinCE6 device.
Probably the easiest way is to put complete Primo on the card, and for the path to the software in the main menu set that indicates to it.
By default, the device uses Mio Mireo (Black Edition) software. The program is attractive and functional, but the maps are not quality and fresh.
If you can access the internal memory of the device from the computer, then easily you can replace the whole software.
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If you want to keep it, then it's enough just to put Primo on external card. Recommended is v.2.0, but device is strong enough for 2.4.
Resolution is standard, 480x272, port&BR are: