If you are still on CM12, yes flash this ROM. I would not try more than once more before going all of the way back to a stock recovery. Enewman17 posted a download link for a stock recovery in this thread. That is a thread on updating to NJ1 (unecessary for you) but I believe in the pages it states that the recovery is the same as for NE4 - check and be certain.
Better yet might be to post in a new Q&A thread and see if anyone else agrees or disagrees about going all of the way back to stock recovery. I would not want to lead you into wasting your attempts and put you in the spot of being unable to unlock. If you do start your own post, feel free to summarize all of the above however you want.
Flashed the rom and it seem to go through fine. I get the stock boot loading screen with the att sound (3 beeps) and the att globe but it stays stuck on this loading screen. Not sure what the problem is.