I have a Nuvi 350, with a 4GB Sandisk SDHC card in it that has a copy of the "Garmin City Navigator NORTH AMERICA NT201510-IMG-ALL-UL" gmapprom.img file on it, in a directory called Garmin. The .img will not fit on the Nuvi itself, as the existing .img is only 1,017,168KB and the updated one is 2,274,880, so there is not enough space.
I put the card in, turn on the GPS and it loads maps but never asks which one I want to use. And if I go to MapInfo I only see the old entry. Do I have to delete the old one anyway, should I rename the update to gmapsupp.ing or did I do something else wrong ?