Touch II --- Linux image issue

Hi all!
I got a kobo TOUCH 2.
As I would like to set a Linux, and more specifically in the end get a linux terminal on it for a project.
By reading numerous threads on this website I got a version (Kobo_Touch2_N587.img) which is supposed to work for this model but unfortunatly nothing happend when I turn it on, get a black screen and the red LED sitll remains on...

I flashed the img with a classical 'dd' command line and all the directories are visibles.

If I put the original SD card again the eReader works fine.

So I am totally stuck and do not know what to do next, if anyone has some tips they are welcome ;)

Thanks
Johann