Do you have a backup of the internal microsd card to share? I am facin the exact same problem. The internal card file system got damaged and only a format got it back, but now I have two partitions. One with 4 files inside a Garmin folder, and another empty one. MY radio is also a DNX690HD
@Vasconia
In case you didn't solve your problem, or if anybody else experiences the same white screen with WARNING! issue on this or other Kenwoods with internal microSD card. I can asisst with reviving the unit. I have gathered this surfing this and many other forums and know exactly how to get the radio back in full working order. Just comment or send me a PM.
Regards!
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