I have a friends Nuvi 57 here and I want to install these City Navigator Europe 2020.20 maps. It does have some Central Europe maps on it but it does not cover some countries that he needs.

I have installed CN 2020.20 on my computer, unlocked it with MapSource Unlock program and I choose the maps that I want in Map Install and send it to device and then on start device says "Unlocking maps is not possible" and it offers just OK.
Then it says maps are damaged and cannot be used. It has CN Europe NTU 2020.20 Central Region maps on the device and they can be removed so I can put whole Europe on the device.

What am I missing ?

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Thank you very much in advance !

SteveOO Reviewed by SteveOO on 10th December 2019. Nuvi 57 adding CN Europe 2020.20 NTU maps ? I have a friends Nuvi 57 here and I want to install these City Navigator Europe 2020.20 maps. It does have some Central Europe maps on it but it does not cover some countries that he needs. I have installed CN 2020.20 on my computer, unlocked it with MapSource Unlock program and I choose the maps that I want in Map Install and send it to device and then on start device says "Unlocking maps is not possible" and it offers just OK. Then it says maps are damaged and cannot be used. It has CN Rating: 5