"Secure" folder, how to revert back encryption.

I installed CM12 nightly a few days ago on my XT1097 and yesterday my retarded brother was messing with it and opened "some file manager app" (his words, I don't know for sure if it was this way things happened) that asked if he wanted to browse the "normal folder" or the "secure folder" and then as he picked the "secure folder", it asked if he wanted to encrypt it, and he promptly chooses yes, picks a password (that he thinks he can remember of) and encrypts the folder.



Anyway, today I restored my stock lollipop backup and everything was still fine but then I decided to flash the crDroid ROM. Now when the device is booting I get a screen that reads: "Encryption Unsuccessful: encryption was interrupted and can't complete. As a result, the data on your phone is no loger accessible. To resume using your phone you need to perform a factory reset". If wasn't for crDroid's message, I would never know of my brother's cryptographic adventures.



I have restored my stock backup and everything is fine again, but I want to know if there's a way to revert this encryption without having to actually perform a complete factory reset. Remember that I have the password (or at least I think I have).



Does anyone have any idea of what happened and how can I unencrypt that folder?

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