The  Dev Team have just released PwnageTool 4.1 that allows you to update to latest iOS 4.1 firmware while preserving the baseband to unlock their idevices using the Ultrasnow 1.1. If you have already updated to iOS 4.1, then ultrasn0w will not work for you.

Those users who have saved the SHSH blobs of iOS 4.0 and later and have upgraded their idevices to iOS 4.1, they can downgrade to iOS 4.0 and then jailbreak and unlock the iOS 4.1.


Jailbreak iOS 4.1 Using PwnageTool 4.1 [How To] :

1) Download the PwnageTool 4.1 and iOS 4.1 for your iPhone (link at the end of the post).

2) Download the latest version of iTunes, install it and reboot your Mac.

3) Backup all the contents on your iPhone before starting the actual jailbreak process. After the backup is completed, close iTunes and leave you iPhone connected via USB.

4) Launch PwnagTool and select Expert Mode.



5) Now select your iPhone and click the blue arrow to continue.
6) Browse for iPSW file (iOS 4.1) which you have already downloaded ( as given in step 1 ).


7) Now you will get several options. Select “General” and press blue arrow to continue.


8) Under General Settings, select ‘Activate the Phone’ if you are on unofficial carrier and want to unlock your iPhone.

9) Under Cydia Settings, download the packages which you want to preinstall and add to queue. You can skip this step.

10) Now you are on Custom Package Settings Page. Select the Cydia Installer and continue the process.

11) Now press the Build button to cook the custom firmware and save it on your PC.
12) Put your iPhone into DFU mode ( Follow the onscreen instructions for this ). It will notify you after you have successfully entered DFU mode.

13) After the iPhone is in DFU mode, launch iTunes and you will be notified that it has found an iPhone in recovery mode. Press OK to continue.


14) To install the custom cooked firmware, press the Alt/Option key and click on “Restore” in iTunes.





15) Now wait for a few minutes. The iPhone will reboot after it has been restored successfully.

Now, you have successfully jailbroken your iPhone on iOS 4.1 while preserving the baseband.

Do let us know how it goes and feel free to ask any kind of queries in the comments section below.

Download Links :

PwnageTool 4.1 ( Direct Download )
PwnageTool 4.1.2 

Note : If you want to jailbreak only, you can also use greenpois0n (here) or limera1n (here) for iPhone 4/3GS, iPad, iPod Touch 4G/3G on iOS 4.1.

Update (10/23/2010) :

PwnageTool version 4.1.2 fix every issues that Mac OS X 10.5.x users were encountering.  You only need to run this version if you are at Mac OS X 10.5.x and were encountering Cydia errors.