You need to spend sometime reading info from Garmin Website.
You can always look at this file garmindevice.xml shows where everything goes on any Garmin Unit be it on the memory or SD card.
All Garmin Device Map Folder \Map (either internal or external on SD) for storing additional IMGs.
Outside this folder only two Maps are recognized, gmapprom.img in folder \.System and gmapsupp.img in folder \Garmin
Outdoor Device use instead folder \Garmin (either internal or external on SD) for storing any additional .IMG Maps you want.
But all of this you should know already if you have done a little research.
And looking back on your older posts you have been dealing with Garmin as far back as 2014 so you should know your way around any Garmin GPS Unit by now.
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