Radio expansion – please for help. I’m stunned (intrusive?)

Hello forum, as reported, I approached the upgrade of the audio system in my 9-3er. The speakers up and in the doors sit so far, now it’s time for wiring. And there’s the problem: I can’t get the radio out of its shaft. Is the Saab original (double-din.). Maybe I’m stupid? With two so radio hooks I can solve the radio and pull out about five to six centimeters, then it’s over. Sounds like somehow metal on Met It doesn’t move any more millimeters. Up, down, left and right shakes and shakes – nothing. Hardly pulled (was already afraid of the dashboard) – nothing. Is there any trick? Thank you Seb.