In Season 11 Episode 9, we saw Rowena perform a spell that makes Lucifer's cage appear, and allow Sam to talk to Lucifer without entering the cage.
As far as I know, the only ways to open Lucifer's cage are breaking the 66 Seals, using the rings of the Horsemen, or probably Death. If by a spell in the Book of the Dammed could free Lucifer, what was the point of breaking the 66 Seals in Season 4? Azazel and Lilith could have very easily found the Book of the Dammed and used the spell to bring Lucifer out of his cage.
What exactly did Rowena's spell do? Did it remove Lucifer from his cage and put him in a temporary cage? If it temporarily brought the original cage, where was Michael? (He's supposed to trapped in the same cage with Lucifer.)