1) stop using caps
2) You must be at the part where you fight some droids then go to an elevator down (or up?). then fight 2 cultist with blaster rifles, kill them. and go through the door and fight somemore reborn then go upstairs. Go through the door and fight the last reborn then, the door in that room should be unlocked.
Xbox 360 Gamertag: cr0wnes7