First of all to get the correct JCV file for the map you need to know the exact map name & number/date. Eg; 2017.10
Then I can find you the correct JCV file for download.
So after you download the map, you simply put the new map & it's associated lock files on an appropriately sized micro SDCard in a folder called Garmin.
Haven’t purchased a map download from Garmin, however I suspect there will be instructions with it when purchased.
In the same Garmin folder on the card, make a folder called JCV & put the JCV file in it.
MicroSD card;Garmin/JCV/correct jcv file.
Don't alter anything on the device apart from choosing the map when you need it.
More detailed info on choices in my Tutorial.
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