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You need to hook up your unit to your PC, via USB, then navigate to the Uniden website and download the Upgrade, the system software for your GPS, this will then allow correct operation.
It tells you what to do and how to do it in this owners manual above.
I noticed this thread had been read 66000 times there:
Is there a map update available for my C-series device? Answer:
are working on newer map updates with Mio More Express software for
C-series devices: C220/S, C320, C520, C720t. The products are in DVD
media because the big size is not practical for download. Pleasse check
back with Mio support later while slight USB driver issue is under