Intermediate report.
Have loaded xml file changed /thanks Caty/. Device was detected by WebUpdater 3790. Download all files offered, but nothing happened.
Flashed with FW 3490 - 3.60 once again - surprisingly it worked, but device was undiscoverable by computer.
Flashed back with 3490-3.60 Kunix cure. Device become discoverable, have checked GarminDevice.xml file - no any change in it.
As it was copied - no a single change.
Whatever I do - so far this file do not change. And I'm fighting with unit computer invisibility when 3490 - 3.60 FW is loaded. So far - no success.
As usual I'm open for any suggestions.