Msftguy is one of the jailbreaking software creator and he is known as PwnageTool bundle creator. In past he released many PwnageTools for different iPhone Firmwares. Once again he is back with PwnageTool bundles for iOS 4.3 Beta 1 but only for iPhone.
This version of Pwnagetool is not so easy for use. The PwnageTool also provides a semi-tethered jailbreak for iPhone 4 on iOS 4.3 Beta1 and for placing iOS 4.3 PwnageTool you will also need to create custom ramdisk on your own.
For download PwnageTool bundle creator for iPhone 4 click here