[HELP] Encryption Issue after return to stock

[Sam Wiles]

Decided to install cyanogenMod to my SPH-L720 because a co worker had told me about their permissions manager. Turned out I didn't care much for the features of CyanogenMod and so I flashed back to stock. My phone was encrypted before the changed to cyanogen and it would seem it's encrypted again now that i'm back to stock. I put in the correct pin(assuming it stayed the same) and it gives the decrypted graphic(android dude split in two with cog-like teeth where his body should connect) and then just shuts down. As it stands I seem to have a brick for a phone. Help me please.