From this detailed guide, you can learn how to install Flimmer Box YT Addon On Your Kodi.
''Deutschsprachige YouTube-Inhalte, sortiert nach Genre: Filme, Dokumentationen, Kindervideos, Autos, Technik, Reisen, Kochen, Gaming, Finanzen, Musik und mehr. Inklusive Kanalverwaltung, Favoriten und Suche. Erfordert ein YouTube-Add-on und einen API-Schlüssel''
this installation guide applies to all compatible devices including Amazon Firestick, Fire TV, Android & iOS, Mac, Windows, Android TV, Android Boxes, etc.
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How To Install FlimmerBoxYT Kodi Addon
- Open Kodi
- Be sure to have the Unknown Source box checked as Kodi requires this before installing 3rd party add-ons.
- HOME Screen > Add-ons > Settings button 
> Add-ons > Enable Unknown Sources.
- From your Home Click Settings (cog icon top left)
- Click File Manager
- Click None
-Type in the following EXACTLY https://eragon-09.github.io
- Click OK
- Click back on your remote/keyboard
- Click Add-ons
- Click Install from Zip File
- Click Eragon
- Click repository.eragon-x.x.zip.
- Wait for Add-On Enabled Notification
- Click Install from Repository
- Click Eragon Repository
- Click Video Add-Ons
- Click FlimmerBoxYT
- Click Install
- Wait till you can see the message Add-on installed pops up. That's it! You can now find you addon from main menu > Add-ons, enjoy.