So, it appears that while on my first playthrough I didn't reprogram all of the units. I got the cards but didn't find the last console. I then proceeded to finish deck 5 but found that Xerxes is denying me access to the elevator. I can't find the elevator I came from and I am stuck. I really don't want to start over again, I'm 8 hours in and it would suck to replay everything. If I can't do anything in game, is there a form of mod or tool to skip it?

But the thing is i've found the main elevator shaft as indicated on the map, but it has a big black brick wall on it. I've scoured the level and found nothing. I remember where I entered (place with dude inside the window) But I can't remember where I started