I accidentally upgraded my Ipod touch 2nd gen "MC Model" to firmware 4.0.2 right before I was going to attempt jailbreaking for the first time.

Is there a way I can jailbreak this Ipod? Or is there a way I can downgrade the firmware to 4.0.1, 4.0, 3.1.3 or lower?

Please help me, thanks in advance.