Just use the Last Firmware you can find with the CORRECT .PIT File!
http://www.4shared.com/download/9Rk1DspGce/i317-i317m-pit-files.zip?lgfp=3000
This is from my Premium Personal Account. I hope with the Pit checked and the correct Model in your case is I337M.pit If you use WRONG YOU BRICK...
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