In my unit in the button keymap you can set different functions to a hardware button, by pressing the required button twice.
The SCR button opens av player by default.
I don't use it and want to start the music app.
So press SCR button twice and in that menu you can choose the Music icon.
Then it will start the music app with the SCR button.
Now you have to be really careful NOT to use the touch button option!!!!
This recallibrates the touch screen, and if you touch the screen then..... it totally screws up everything...
Only solution then is a reset and you can start all over again.
---------- Post added at 11:33 AM ---------- Previous post was at 11:19 AM ----------
Next thing NOT to do is in "others" tab.
There was some "power" option which default i think was "on".
Options there are "on" "of" and "remember last status" .
In my opinion the radio turned off to quickly, even when power down was set on 5 minutes (in android settings).
So i first saved this "power" thing in factory settings to "on".
Off course the radio stayed On after turning off ignition.
So i waited 5 -10 minutes, but it stayed on.
Then i made the biggest and most stupid mistake in my life and tried "off", and guess what.
It does not turn on anymore.... ****** (I should have guessed that).
According to the helpdesk, the radio should start in recovery when holding reset for 3-5 seconds.
But the button backlight (red colour) only blinks once when you release reset, and that is it.
Holding the power button for 10 seconds turns on button backlight as long as you hold the button.
I did receive their latest firmware so i could flash it in recovery, but then it has to boot first...
Now i am waiting for the next answer from the helpdesk, but for now my unit is dead.
I hope this message helps others to prevent making the same mistake.