How can I downgrade my iPod from 4.2.1 to 3.1.3 for a jailbreak?

Adam M June 13, 2011
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I am trying to downgrade my iPod Touch 3rd generation from 4.2.1 down to 3.1.3, so I can Jailbreak. Everything I have tried has failed. And it keeps saying it is not compatible with my iPod. Please help.