PwnageTool Bundle for Jailbreaking iOS 4.3 Beta on iPhone 4 Released
If the unofficial version of PwnageTool didn’t work for you, alternatively, you can now give PwnageTool bundles a go for jailbreaking iOS 4.3 Beta on iPhone 4. However this kind of jailbreak is strictly limited to iOS developers only, and will require you to have a Mac, and you must also be enrolled in either iPhone Developer Standard or Enterprise Program.
WARNING: The jailbreaking procedure is complex, and hence is meant for advanced users only. It will require you to make your own ramdisk because the latest official version of PwnageTool makes a broken one for iOS 4.3. Proceed at your own risk only. We are not to be held responsible if you end up bricking your iPhone.
Your baseband will not be upgraded during restore process.
Use a utility like tetheredboot to boot into tethered mode. (instructions can be found here)
This custom PwnageTool bundle can be downloaded from iPhone-Privacyhere. You can use the instructions posted here to modify PwnageTool with this bundle to accept iOS 4.3 beta firmware, and then follow the instructions posted here to create iOS 4.3 custom firmware for iPhone 4.
Change the restore options: edit /Volumes/ramdisk/usr/local/share/restore/options.plist with Property List Editor, add ‘UpdateBaseband’ = false – see http://theiphonewiki.com/wiki/index.php?title=Preventing_Baseband_Update for details
Unmount the ramdisk: hdiutil detach /Volumes/ramdisk