As reported from RedmondPie, the Redsn0w jailbreak tool isn’t available on the iPhone 4 or new iPod Touch yet, as iPhone Dev Team member MuscleNerd has confirmed via Twitter that the iPhone 3G and 2G iPod Touch are the only supported devices at the moment.
Unlike other jailbreak methods, this one doesn’t seem to be straight forward, so we only recommend trying this out if you have performed such tasks before. If you’re willing to give it a go, you will find a complete set of instructions over at RedmondPie here.
Can you confirm that the Redsn0w jailbreak 0.9.6 tool works for the iPhone iOS 4.2 beta? Leave us a message so other users can try it out.