Thread: Kenwood DNX9990HD: Loading 2014.30 Maps on Internal Memory - It Works!

I Just installed the latest map on one unit I got extremely cheap... It's DNX4280BT and this is alpha&omega of what should you do with it in order to update the maps (in this case it's CN Europe 2019.2 NT). The problem was that this unit is not equipped with the mini-USB port for connecting directly to computer, nor it has SD card slot. Just USB-A female port for your USB-A dongle. I think it's the same for any similar device, with possibility to upload JVC, ASR and similar files on some newer devices. So, let's begin:

1. Update Kenwood unit software (in my case, it was to 1.9) and Garmin software (to 4.5 on my unit).
2. You need to collect the device's signature. In order to do that, find some empty 8GB USB and go to Garmin start screen, then "Settings", then "About" and you'll find "Update map". Click on it and the device will ask you for an empty USB in order to sign it. Follow the instructions and, subsequently, remove USB when done.
3. Open Garmin express and perform simple, ordinary map update, so the root of your USB device will have Garmin folder and: GMAPSUPP.IMG, GMAPSUPP.UNL, GMAPSUPP.GMA and GarminDevice.xml inside of Garmin folder (ROOT/Garmin/GMAPSUPP.IMG, GMAPSUPP.UNL, GMAPSUPP.GMA and GarminDevice.xml). Delete GMAPSUPP.IMG and leave everything else intact.
4. Generate the map using your Garmin Map Source software (I'd leave it on around 2.5GB, although GarminDevice.xml says it's got around 4GB free inside). Copy the newly created GMAPSUPP.IMG to the USB where you've deleted the previous file of the same name.
5. Insert the USB to the unit, wait for the device to recognize your USB and starts to search media (5-7 seconds) and go again to "Update map" interface (not that you should ever have left "About page"). It will ask you to update. Click Yes, obviously and wait. It took somewhere about 25-30 minutes to transfer 2.4GB

That's it...

Cheers