@quebec001
NA 2014.40 is over 2GiB. Can you please post a screenshot of the Map Info page showing the complete NA 2014.40 recognised by your 350?

I've now tried 5 different 3x0 series nuvis, 1 x AU 300, 2 x AU 310 and 2 x NA 360 none of which will recognise a map image over 2GiB but will display 2014.30 which is indeed 2,122,612,736 bytes or ~1.98GiB, just under 2GiB.

All 5 units will also accept a Toshiba 16GB microSDHC Class 6 and a Sandisk 64GB microSDXC-I [reformatted to FAT32] in an SD Adapter. Definitely card size is not an issue in nuvi 3x0 series just as it isn't in later nuvi series.