I try explain one more time.
1. Garmin update firmware from 2.20 to 3.50 failed. After that i have LOADER LOADING.
2. Kenwood DNX is a multimedia station and have your own firmware. Now 1.9.0
3. Inside Kenwood is mounted navi board from Garmin. Below are the pictures.
4. DNX 7240BT have no SD card slot. When try update firmware from CD I got READ ERROR. I burned a few CD's and DVD's and always READ ERROR.
It's worth mention, main firmware DNX multimedia station I upgraded from DVD. No errors. From 1.2.0 to 1.9.0, so therefore I exclude the possibility that the wrong DVD or CD was burned.

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