[Update: Version 4.1.1 should fix any issues that OS X 10.5.x users were seeing. You only need to run this version if you’re at OS X 10.5.x and were seeing Cydia errors] source: iPhone Dev Team.
As the words say, this one only to those who experience troubles using PwnageTool 4.1, therefore if you are not one of them, then no need to download this PwnageTool 4.1.1.
- Download PwnageTool 4.1.1 for Mac [Mirrror] [Mirror]
- And then you are able to proceed to the next phase, which is jailbreak jailbreak for iPhone 4, 3GS, 3G On iOS 4.1 using PwnageTool 4.1 (Don't worry because the instruction says for PwnageTool 4.1, because the steps are the same, you can follow them to jailbreak your iOS Devices using this version of 4.1.1)