Kodi 17.1 FireTV black screen after playing arround…

Hi

I installed Kodi 17.1 on Amazon Fire TV Stick (Alexa Version) using AppStarter.
All worked fine so far

Then i installed Kodi on PC as well, configured it and wanted to transfer everything to the Fire Tv using Plugin “Backup”
This generally worked, but not everything. eg. he didn’t transfer settings of skin Aeon Nox.
I played arround a bit. eg. tried to backup additional directories.
Well.. i think this wasn’t clever, cause as i know now, the directories are different on PC and Android

Now, Kodi don’t boot anymore Sad
I just get a black Screen! I only can quit to FireTV TV Menü using the Home Button on the Fire TV remote

I already reinstalled Kodi.
On first start kodi tells me, that it’s going to configure for first boot – then again black screen

At the end i resetted the Stick to factory defaults, but even this doen’t help!

The Fire TV Stick itself seems to still work fine

Any ideas?
Thank you very much for your help

Quicks