It's about the Trinity Restored questline. I met with Karliah and Brynjolf at the Nightingale Hall, she gave me the armor I put it on. The next part is where the ceremony starts. Usually Karliah pulls a lever to open the gate, sadly she went out of the dungeon it isnt coming back.
Brynjolf stands infront of the gate doing nothing. I tried skipping, setstage, completequest but it doesn't help. If I completequest via console I cant start the next quest. If I port Karliah infront of the gate she starts the lever animation but the gate won't open.

I have no savefiles from before this so this is the last chance I'll have because I really want to complete that Thieves Questline.

Are there no options anymore? Is there any command that works?

I'm having the same problem She pulls the chain over, and over, and over it never opens the gate