downgrading to stock firmware galaxy s4

Hi I have galaxy s4.
Please if anyone knows how to: I have galaxy s4. First I downgraded the modem to mdc, than rooted the phone and upgraded to "kit kat cyanogenmode 11". now I won to go back to the stock firmware but odin keep failing. it starts fine checks the md5 but when it starts to write the files it says "fail (auth)" . Does anyone know how can I flash the stock firmware in my case?
I am trying to go to stock firmware so I can try to unlock the phone. or is there any method to unlock it at all?

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