I just updated my maps on my Kenwood DNX994S. Was on the original 2017 maps and loaded the 2020.30 NT North America maps. Using the method that stickweld shows. I renamed the unlocked map image file to gmapsupp.img and created two empty files: gmapsup.unl and gmapsup.gma. This was all done on an SD card. I did initialize the card on the head unit to create the Garmindevice.xml file. Thanks for posting this information!
Jr!
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