Cm12 not recognized by Odin download mode

I don't understand why ClockworkMod 12 does not work when you put it in download mode Odin will not recognize it I have galaxy s4 SGH i337m and I would really like to go back to stock and I cannot change my phone I can add another room I cannot do anything with the phone now so why don't these people make a fix for it I'm beginning to feel sorry I put clockworkmod 12 on my phone even though I like it its a piece of crap I even bought Mobile Odin hoping that would work and Mobile Odin says it has the wrong partition on my phone somebody please help me

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