Hey,
well i found the issue.
Inside the Box is NOT a RK3229 but a AMLogic S805 on a m201C_AP Board.
After i knew that, it was more a "easy" to run Armbian on that device.
Right now i´m running Debian Buster on a 128GB SD and it seems to running well.
But is there a way to get it on the intern flash?? I think this will not be the right place for asking that in this post. So if anyone has a link inside the Forum it will be amazing.
I will also search by my own.
@Vittorio Mori nice i will take a look at it thanks for the hint.