Could be that the size of the map is also a problem. zumo 550 was released about 7 years back and originally had [still has?] the FAT16 2GiB file size limit. Support was added at some point for 4GB+ SDHC cards with FAT32, but maybe not for >4GiB file size limit. Of the same vintage, nuvi series 2x0/3x0/5x0/6x0/7x0 were all released around 6 to 8 years ago and all originally had the same 2GiB file limit. All of those now also support SDHC cards with FAT32 but notably only some support file size limit to 4 GiB. nuvi 3x0 and 6x0 for instance are still stuck with under 2GiB, so maybe the same with zumo 5x0?
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