Ok, so now i deleted all files from the SD card and reuploaded all files from the Wiki. -> Sensor was found!
Then i just had to reinsert M558 P5 I1 etc. and it immediately worked.
So it seems that my file structure was wrong and that was the problem.
My distant friend, i would like to thank you for your help and patience - guys like you make the internet great!
BR, Norbert