I'm 100% positive. Even checked the MD5 and everything.Everyone getting Failed to get CIA file info: Are you sure you're using the right downgrade pack? The O3DS and N3DS packs are completely separate.
Also, if you're using a Mac, I hear it likes to mess with the /updates/ folder and add extra hidden files. Somewhere like page 12 or so someone else had this same problem, and solved it 2 pages later.