Finally, Dev-Team had released the untethered jailbreak for iOS 4.3.1 on all iOS devices from iPhone to iPad(except iPad 2) their next objective was to update Ultrasn0w to work on iOS 4.3.1. iPhone 4 users must take extra care while updating to iOS 4.3.1 as they need to prevent the baseband from upgrading. This update only brings iOS 4.3.1 support to basebands which could be unlocked earlier. Therefore, only baseband 01.59.00 can be unlocked on iPhone 4.

Here's the list of basebands that can be unlocked using Ultrasn0w 1.2.1:

iPhone 4:

• 01.59.00

iPhone 3G/3GS:

• 04.26.08
• 05.11.07
• 05.12.01
• 05.12.04
• 06.15.00

Note: For T-Mobile users in USA should disable 3G under Settings > General > Network. This is due to an incompatibility with T-Mobile’s 3G. Those in other countries do not need to do this, unless they face a problem.

Step 1: Use PwnageTool or Redsn0w to jailbreak your iPhone.
Note: For iPhone 4 users, must use PwnageTool since Redsn0w does not create custom IPSW which is required to prevent baseband upgrade.

Step 2: Launch Cydia on iPhone and add “http://repo666.ultrasn0w.com” as the new repository URL. You can simply tap “Manage” -> “Sources” -> “Edit” -> “Add” to add the repository URL. If your not clear about this, checkout my post here on how to add sources to Cydia. This step only for beginner users, for those who already know about adding repo you may ignore this step.


Step 3: Then tap “Search” and search for “ultrasn0w” application

Step 4 : Install “ultrasn0w” and then on confirm. If you have already installed Ultrasn0w before, you will see a modify button instead of Install, like in the screen shot above.

Step 5: After, Cydia has installed Ultrasn0w, you should reboot your iPhone. To restart, press and hold the power button till you see the slide to power off screen. Now slide the button to turn your iPhone off and then turn it back on. You should now have an unlocked iPhone with iOS 4.3.1.

As for now, iPhone Dev-Team has releasing Untethered Jailbreak for iOS 4.3.1. This is a good news for those who accidentally upgrade or stuck on this iOS. This jailbreak has been made possible by the untether exploit found by i0n1c or Stefan Esser. Stefan then turned over the exploit to the Dev-Team who have been trusted with stable jailbreak solutions over the years. With the combined effort of Dev-Team and Stefan Esser we know have an iOS 4.3.1 untethered jailbreak solution for all iOS devices except the iPad 2.

The updated version of RedSn0w is available for both Mac and Windows users while the PwnageTool will work only on Mac. The jailbroken only compatible as listed below using this tool.

• iPhone3GS
• iPhone4 (GSM)
• iPod touch 3G
• iPod touch 4G
• iPad1
• AppleTV 2G (PwnageTool only for now)

The iPad 2 users will have to wait a bit longer since the bootrom exploit does not work on iPad 2 yet.

Stay away from this tools if you require Ultrasn0w unlocking (Ultrasn0w users)!

If you require a software based unlock for your iPhone then you must wait for a while. Ultrasn0w update will be released soon to support unlock on iOS 4.3. Also, you must be careful while updating to iOS 4.3.1. You need to use custom IPSW to prevent the baseband upgrade.

If you don’t care about an unlock and have been waiting to upgrade your iOS device to iOS 4.3.1 you can take the leap now as you have a stable jailbreak release.

You may download redsn0w 0.9.6rc9 here:

OS X redsn0w

Windows redsn0w

Pwnage Tool 4.3

iPhone Dev team updated ultrasn0w to v0.9 with lots of bug fixes. As claimed, this version fixed numerous issues that were found on older version of the unlock software.

Same as the previous version, ultrasn0w 0.9 can unlock both iPhone 3G and 3GS. Before using ultrasn0w, the iPhone should be jailbroken via redsn0w, PwnageTool or Purplera1n. And, as always, ultrasn0w is now available to download via Cydia.

As I know, some readers have tried the older version (i.e. 0.6 or 0.8) of ultrasn0w but failed to unlock their iPhone 3G. Also, some reported the missing SIM or no network issues. As claimed by the dev team, the latest version of ultrasn0w already fixed these issues. So, if you fail to unlock your iPhone 3G or 3GS, try out ultrasn0w 0.9.

For those who experienced a reduced battery life after using ultrasn0w, iPhone Dev team also mentioned the issue in its post:

ultrasn0w 0.6 did have a problem where the STK refresh command it used crashed the baseband in 3G S. This caused the baseband to continually come up and then restart. That DOES take power and so may explain the issues that people have been seeing. ultrasn0w 0.8 was supposed to have fixed this issue, but perhaps not completely.

With the release of ultrasn0w 0.9, it’s supposed you’ll not experience reduced battery issue. To learn about how to unlock iPhone 3G using ultrasn0w, check out this guide for detailed instructions.

iPhone Dev team may have kept you waiting for the release of jailbreak tool (codenamed redsn0w). As demonstrated by the team previously, the jailbreak for iPod Touch 2G is a success but the jailbreak process is quite manual and not so straightforward, as you may have done on iPhone. And the team is working really hard to bring the jailbreak tool to the mass.

Why can’t iPhone Dev team just release a good tutorial and let advanced users to follow?. May be you have even more questions. Thanks to Caleb Mingle. Caleb Mingle has collected all the questions (asked by iPod Touch users) and answers from members of iPhone Dev Team, and compile a Wiki FAQ. The FAQ is very comprehensive with all questions you are interest about. Here are some of the interesting Q&A:

What exactly is a ‘tethered’ jailbreak?

A tethered jailbreak means that the patch (redsn0w), must be injected every time the iPod touch boots. Sleep Mode does not affect this, and is not considered a reboot.

Why can’t you release it now, what’s the problem?

This is what we’ve been looking for for the past couple of days…a way to compromise the system lower than the level we’re at, to break the tethering requirement.

If it takes too long to find (if we conclude that we’re “stuck”), then we’ll just release the tethered version and let you guys jump through the hoops needed to get it to work (and without us redistributing Apple software of course).

But that would be a headache for everyone, so we’re looking for something a lot easier to use than that. - MuscleNerd

Why won’t you just release a manual method? Is there still hope for one?

The manual method would require us to also redistribute software we have no legal right to redistribute. - MuscleNerd

The hope is for a non-manual release

The manual (tethered) release will come, if prospects for the non-tethered version vanish.

But we’ve only had a fully jailbroken system since Saturday. And we only started looking at this whole thing a week ago (except for that quick look-see back in September when we thought it would have more usefulness for the iPhone). - MuscleNerd

For the complete collection of Q&A, you can check out the Wiki FAQ. Though iPhone Dev Team does not make any announcement on the release date of the jailbreak tool, I won’t expect it’ll take too long.

A very good news for iPod Touch 2G users , iPhone Dev Team has announced iPod Touch 2G can now be jailbroken using a software with codename “redsn0w”. This incredible team has once again made the impossible possible. Earlier, they can only manage to jailbreak iPod Touch 1G. But for iPod Touch 2G user, you’ll have to wait for a little while. As mentioned by the team, they have proved the jailbreak work but the procedures is too manual that it’s not ready for novice. Don’t worry. iPhone Dev Team will develop a simple tool for the jailbreak. Probably, the tool will look like QuickPwn for iPhone and iPod Touch 1G.

To demonstrate how the jailbreak works, iPhone Dev Team has published a video on Qik:

The iPhone Dev-Team warns that installing the iPhone 2.2 firmware might prevent a software unlock when it is available. They were also thought a good news about unlocking iPhone 3G progress.

And they said:

"We’ve made some decent progress with the iPhone 3G, nothing worthy of a party as yet but we are moving along nicely, we’ll keep you updated on this.

Now for something a bit more serious, we’ve explained about Apple’s updates in the past and we’ve warned against the immediate installation of these updates without knowing what they do to your device.

This is indeed true of the iPhone 3G’s upcoming 2.2 release. Installing ‘2.2’ on the iPhone 3G could affect your chances of any software unlock in the near future (should one be found and released), so when you see an update in iTunes await our instructions first!

Please don’t blindly install the update and then complain about it later ;-)

I'll post the safe upgrade path when it becomes available. Read more details on their blog.