You can downgrade it using Pandora's Battery (which is basically the JigKick method you may have heard about).
Or, you can use the downgrader that uses the TIFF exploit (it's not as safe, and there are side effects).
Look around on google to find the downgrader and/or Pandora's battery software (I forgot the links, and I don't feel like chasing them down), and read the instructions.
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