Hey Khaldoun, thanks for your question. Unfortunately I am not in Bayreuth to help you personally, but I have some ideas for you.
I hope you still have your paperwork organized. It goes a long way of you know who you want to talk to. Call this person or make an appointment to talk to this person.
It may sound stupid but it even helps of you can find a German volunteer to go with you and help you.
I found that this site might provide additional information for you in Bayreuth