DNX7200 update

Hello, I have got an Kenwood DNX7200 for free, now people start to laugh, but, it still works fine.
The only thing i want to know, if the gps is still updatable, and how.
I try to download the sytem info, that is been given by garmin.
Go to navi, Settings, system, over, and update maps.
But i dont see the system button.
Maps i can download here, but how to install, and how big.
Please help.

All i want to know, is how to get info from my device to an SD card, from there, i can handle it, or if someone knows how to put new navi software on the device, its also okay. Just want to use the radio and navi, but with up to date maps, for the radio, it works fine, and the dvd also plays perfect. Only i want are recent maps.

I remember that if i put a map on an sd card, i have to make also a garmin map, but must i also make a map called "maps" on the sd card. Must that be a submap of Garmin, or olso in the root.

Put a blank SD card in and go to nav/settings/device/update. It will ask for a new SD card and then it will print unit ID on it, remove and go to Garmin Express software. install, put SD card into readwe and then tell GE to search for new device, it should find your radio model off the SD card, then install any updates through software. Thats how my DNX570 works.