Problem loading miomaps v3

I have a Mio A201 digiwalker that I am trying to load with MioMaps version3.
whilst I can load the install software on to my PC, each time I try & upload a map to the mio I get the following message.
"Unknown device processor type. 2577 or OS(351)" as I select the storage card option on the sotware.
Can anyone assist?

Do I need later version software?

Do I have the wrong type of SD storage card?

Any asistance greatfully received

Hi, I have just purchased a Mio A201 with MioMaps V2. I did not know that a V3 was available and cannot see anywhere to upgrade on the Mio site. Could you tell me where to get it from.
Thanks