I've been reading the threads and trying to replace my original internal North America NT 2010 with a North America NT 2016 .img file, but it keeps stating not enough disc space. I'm in the .system folder, removed the original .img folder, but still won't let me install new map .img. I have a Nuvi 1350. It states file is 176gb and only 150gb is free. What am I missing? I'm sure it's something simple. TIA!