I got a 8GB MicroSD card and tried it.
The Garmin was now 18 hours with black screen on my desk. I do not know if it was actually off.
I put the SD card in the device and connected with the charging cable. After 10 minutes I tried to start it normally, apparently nothing happened. After pressing the power button for 10 seconds, the screen turns on. After that I waited again for 10 minutes and again nothing happened.
I think I can't get the device to turn off completely. Maybe I should try to drain the battery so I can be sure it is off.
Edit:
I think it loops and loops and loops. I watched it 4 times: screen off, screen on, screen dimmed, screen off.
Plugged it to my PC again, MTP is still working. the .xml file is still the old one. It should be something new i think.
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