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Sorry, I didn't mean to offend. You are right, I know nothing about your business, so I should have just not posted rather than making a useless suggestion. I hope you can find something that works.
It could show up any time. The CN EU 2019.10 NTU map was released June 6, 2018, so Garmin was just as "late" last year.
To get the .system folder and files to show you need to change your device from MTP mode to mass storage mode.
See Boyd's comments in this post: http://forums.gpsreview.net/discussion/comment/208926/#Comment_208926
30x probably not as popular as 20x. If people are willing to pay the extra cost for the barometric altimeter and magnetic compass, they may go a step further and opt for a GPSMAP 6x or Oregon.
Did you mean nuvi 500 or 550 instead of nuvi 50? I believe the old nuvi 5x0 series (circa 2007) is the only road navigator Garmin has ever made that was geocaching friendly. If you truly meant the newer nuvi 50 (circa 2011), it was an entry level device and did not have any built in geocaching features. Any modern Drive series unit would have a much richer feature set than the nuvi 50, but would still not have specific geocaching features.
The GSAK macros that install the Geocache data on a nuvi device convert the geocaches to detailed GPX entries and install with Garmin's POI Loader program. That should still work fine on any of the modern Garmin road devices. I have used it on my 2013 nuvi 3597. The only thing that may not be acceptable is the way the modern devices decide to display (or not display) the custom POI icons while navigating. On my 3597, the geocaching icons do display while navigating in 3D mode, but the ones installed by GSAK are very tiny on the 3597 screen. That is OK for me, but some folks may not like it.