Put the full version in what? The nüvi 250 or the 4GB SD card?
You won't be able to get the full version in the nüvi 250 simply because the internal memory is not sufficient.
You will be able to get the full version on the 4GB SD card and working in the nüvi 250. Make sure to name the map file gmapsupp.img and to create a folder named garmin on the SD card in which to store the file.
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