Bro, i think i somehow have messed it up really good…
It doesn’t boot. When i tried to upgrade i used the latest u.boot. Maybe something went wrong there. Also because i have no video-output i also cannot see if anything works like trying in to the upgrade-mode. The device also doesn’t get warm (although maybe this is because the GPU is not running)
Edit 2: I am starting to get pro in this :P. Well change of planes. I wanted Ubuntu especially, but Kodi on Ubuntu is rather outdated. I have to compile my own OR use (armbian + kodi) from balbes150 which that looks like a better option, as many of the bugs already have been solved in it Or the Ubuntu version of it also created by balbes150. Anyways, thank you as this topic could be branded as solved.
Solution: There is eMMC and there is SD-CARD.
Booting card = SD-card like a live-cd
Burning card = Using SD-card like a installation CD to install on the eMMC.
balbes150 gives even the possibility to use USB-flash-drive instead of SD-Card OR eMMC.
Installing using USB method with usb-cable directly attached to your computer/laptop just does the work without whole SD-CARD step first.