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Although your latest phone may include pre-installed regional maps, this is not always so and you are not restricted to choice made for you.
Firstly it is always worth checking whether there is a newer version of Nokia Maps available for your device as latest phone firmware does not always include most recent one, so have a look here: http://europe.nokia.com/A4984199 You will also find latest version of Nokia Maploader v2.0.2 application for your PC available to download at above link. One of the requirements is that Microsoft.NET Framework 3 is present and if not already on your PC, you will be prompted to download this also.
For devices still using Nokia Maps v1.0 maps are stored in "Private\20001f63\diskcache" and Nokia Maploader will expect either device to be connected in "Data transfer" mode or memory card inserted in card reader on your PC.
For devices using Nokia Maps v2.0 maps are stored in E:\Cities and Nokia Maploader v2.0.2 should connect with device in default "PC Suite" mode however if you get the message "Waiting for Device" it is worth changing to "Data transfer mode on device USB interface instead. Similarly memory card can also be placed in memory card reader on your PC and accessed as a mass storage device.
In ALL cases it is necessary to run Nokia Maps application at least once with memory card in device to define folder structure required by Nokia Maploader.