Okay great, there is this iranian association located not so far away that offers every month (usually the first one of the month) law advices for free.
I hope that will help.
I wish you a nice evening!
Address
Verein Iranischer Flüchtlinge in Berlin e.V.
Reuterstr. 52, 12047 Berlin
+49 (30) 62 98 15 30
VereinIranischerFluechtlinge@gmx.de