Okay, with the help of user Lucky I got new revelations about the f-key problem. We both tried to do exactly the same operations and use the same programming files and exchanged our results live via skype.
In his case it worked... in my case it failed. So, a quick conclusion would be that my Thales replica does not work properly on the hardware side. Could be a damaged circuit board, broken buttons etc...
I am really sad.
