Ok. I changed the hdmi cable and connected it to another port and, at least, I got a familiar Andoid front page! Don’t know what exactly was wrong. Woks now like an Android tablet quite well!
bought that device for 2 specific projects. I want to use it on a Chevrolet Volt to basically have it run Android auto on the car screen. It is a cheap solution instead of buying an expensive comparable cellphone. It will stay in the car fulltime and I think I will interface it with TeamViewer and also a VNCViewer. All this can’t be done with a Raspberry Pi. I already have installed AA and Waze. Looks good.
The second project is to have ZoneMinder (camera management program) installed on a Linux distribution (most probably Ubuntu arm version ) as the Khadas Vim has more power and memory to run ZoneMinder than the RPI3. Will see if it really performs better.
Things appears to be more positive now that, at least, I got it working. Anyone knows if this can run the HiFiBerry Audio card (DAC)?