Older units such as your nuvi 350 cannot use *.img files above the FAT16 size limit of 2GiB - 1 byte [2,147,483,647 bytes]. Even though it can use a large SD card formatted in FAT32 that file size limit is still imposed. Split an EU map into a couple of parts using a PC Install [Mapsource] version and you can install the biggest of the 2 img files [less than 2GiB] on your card and the smaller part on your 350's internal flash drive [if you have the space there]. Otherwise, you cannot have the entire EU map as it's well over 3GiB in one file. Btw, the latest NT for EU is 2015.20 now: [Only registered and activated users can see links. ] and release of 2015.30 is imminent.
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