SD\Garmin\gmapprom.img (unlocked with gimgunlock)
SD\ Garmin\JCV\D30601x0A.JCV (You must use the JCV file from the same map version:2015.30 map+2015.30 JCV)
Check that no other files are on the USB drive.

[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
Make sure the USB is formatted to FAT32.
If downloading the "unlocked" maps, your unit still asks for a key, use Jetmouse and create an unlock code with the FID of the map and your unit id.
[Only registered and activated users can see links. ]

Insert the USB and it should start reading files. It reads and then says it find an update. Then it gives you your unit number and says to go to a website for a key..
Use Jetmouse and FID:xxx to generate code. the unit should accept and starts the installation.
when installing reading file could take anywhere from 15 mins to over a hour to read depending on USB stick (I would buy a fast one for this ) make sure your Nav is not active (don't make that mistake to keep it in direction mode.)
Once the install is done it will might say PND updated then it will say maps failed don't worry the maps loaded ( I think this is because the software is double checking for maps name which should be OEM maps name version.)
To check if the JCV file is installed: If you go into engineering mode, developer menu, and then file browser you can see the actually name of the JCV file installed.
If you have a 2011 or 2012 (early builds of the radio) you need to downgrade the firmware of the radio down to 23.xx.xx or update might not work.
33.x.x iso here:
Code:
Please Login or Register to see the links
CD only for software updates (no DVD)

Source:
Spoiler: link
http://www.wranglerforum.com/f274/430n-rhb-updated-with-garmin-city-navigator-2014-10-nt-262278.html