step 2: getting root-access on kindle : solved
I did like hondamarlboro told it in:
How-to obtain root access of New Basic Kindle (2014) FW5.6.0.1
I am not allowed to change the computersystem (yes, its not my homepc), so I using a kubuntu USB-Stick version and it works quite well.
I had to install the cp210x drivers and minicom and then connect to my kindle like knc1 wrote bevor in this thread.
*first i thought minicom did not work, but the kindle was in sleepmode once running i got messages and i was able to type commands
next problem was the pyhton script.
It took a while to realise I simply had to execute it on my pc not try to get it running on the kindle

Thanks to Glorfindel@IRC - the intern irc-client is very nice forumfeature btw. -
I got the
Root-PW-Generator-Page and got my root-pw with it.
The PW by the phytonscript mentioned in hondamarlboros 'HowTo-root-access' was not functional (ok, my rootpw 'mario' should be the first try for someone who is familiar with kindles ... )