update works on a DNX5190 with 2019.10 NT NA. no special .unl or .gma
Just successfully loaded into internal memory a 2019.10 north america unlocked map on a DNX5190 that had previously a 2012 map with no options from Kenwood/Garmin for a new map.
First I updated the kenwood DNX5190 with the latest available firmware from kenwood site.
I did not have any sample .unl or .gma files so just made 2 dummy files using MSword and renamed them gmapsupp.unl and gmapsupp.gma
I used a blank thumb drive and let the DNX5190 write the Garmindevice.xml info file to it. To that garmin directory I added an unlocked gmapsupp.img of 2019.10 NT North America (2.802 Gb in size), and made two dummy files using MSword called gmapsup.unl and gmapsup.gma. Once those four files are in the garmin directory, the head unit happily loaded the map from the thumb drive when I selected update on the Kenwood. After completion, i reset the head unit and it now the map info shows it has the new 2019.10 map loaded.
The DNX5190 does not have a SD card slot or rear mini USB. It only has the single USB port on a cable. I was surprised it accepted the dummy .unl and .gma files. I thought they might "brick" it. After loading the new map, the unit has just 296.5mb free space according to the garmindevice.xml file where prior to the 2019 map update it had 1.479 Gb free space.
This site was a huge help in getting this to work and I joined just to post my success and help out by adding one more model to the list of units Kenwood says can't be upgraded, but obviously can if you know how.
Works (sort of) on DNX6960
Just got new maps working on a DNX6960 (2010 unit). It had/has upgraded 2011 maps installed in the internal memory. Reading the DNX6960 manual it is vague to say the least regarding how to officially upgrade the maps. Basically it tells you to go to garmin.com/kenwood and follow instructions. No upgrades are any longer available for this unit there, but I'm assuming there once was an app or technique available to get upgraded maps installed internally via a dedicated map update MicoSD port.
Anyhow, tried using the USB terminal on the rear to install the 2019 maps but I had no luck. There is also a mini USB port which I have not tried yet (need to dig out the correct cable to do so) but given that the DNX6960 has a MicoSD slot dedicated for map updates I doubt that is even worth the effort. But...
for sh!ts and giggles, following Stickwell's lead, I copied an unlocked [Only registered and activated users can see links. Click Here To Register...] of 2019.10 NT North America maps to a blank MicroSD along with two dummy versions of gmapsup.unl and gmapsup.gma. I did not have the Garmindevice.xml file so did not include it. Once I booted up the unit the map info shows it has the new 2019.10 map loaded. So it appears to be running from the MicoSD card. Would love to get the maps installed permanently so given that the unit is not yet installed in my car I may just take her apart to find the internal storage and try playing around with the map files there.