iPhone iOS 4.2.1 Ultrasn0w Unlock Now Live: How to & Download
We’ve waited all weekend long and it looks like the iPhone Dev Team has finally launched this expected iOS 4.2.1 unlock. In case you own an iPhone 3G, 3GS & iPhone 4 and want to unlock your device, then make sure you follow the exact instructions of the iPhone Dev Team (available after the break) and download the new version of Ultrasn0w and free your device from the chains of your carrier.

Naturally before we go any further we’ll advise you that you’re the sole responsible for whatever happens to your iPhone, and that we’d never suggest you should put your iPhone through any jailbreak and unlock process.
And now, without further ado, here are the full instructions / how-to guide from the iPhone Dev Team as well as the download links you’re looking for:
Today we’re pleased to announce our free carrier unlock for iPhone3G/3GS owners with a baseband later than 05.13.04. The unlock for that baseband exploited the AT+XAPP command, thanks to a crash initially discovered by @sherif_hashim (@Oranav also found this crash). So what hole are we exploiting today, since Apple closed that AT+XAPP hole? Well, we’re exploiting the exact same hole!
It turns out that the very first iPad firmware 3.2.2 has baseband version 06.15.00 still vulnerable to AT+XAPP. The iPad baseband is built for the exact same baseband chip as the iPhone3G/3GS — they’re fully compatible! Some of us have been running 06.15 for weeks now on our iPhones in preparation for this release.
Since 06.15 is a higher version than 05.14 or 05.15 (where AT+XAPP is gone), anyone stuck at those versions can simply upgrade to 06.15 to unlock again! Luckily for us, Apple *still* provides the iPad FW 3.2.2 with this vulnerable baseband right from their own servers. (Grab it now, before they take it down!)
We’ve been busy updating both PwnageTool and redsn0w to make the baseband update as seamless as possible.
1. First up is “PwnageTool 4.1.3 Unlock Edition”. It has a special dialog box which will ask you if you want to update to the iPad baseband. You must already have the iPad 3.2.2 IPSW on your computer (see the above link)….so just point PwnageTool at it (or let it find it on its own if you’re in “simple” mode).
2. Directly after PwnageTool 4.1.3 is available, the official ultrasn0w repo http://repo666.ultrasn0w.com will be updated with ultrasn0w 1.2, which covers iPhone 4 baseband 01.59.00 and iPhone 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01, 05.13.04 and now 06.15.00.
3. Finally, we’ll release an update to redsn0w today for those without Macs and can’t run PwnageTool. The new redsn0w will give you the option to update your baseband to 06.15 too.WARNING — YOU DO THIS AT YOUR OWN RISK! PLEASE UNDERSTAND THE CONSEQUENCES OF UPDATING TO 06.15.
1. There is no way to come back down from 06.15, and there’s no hiding the baseband version from Apple. You’ll be voiding your warranty in a very obvious way.
2. If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail). You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).Certainly don’t update to 06.15 if you don’t need to! Only do this if you need the unlock and you’re stuck on 05.14 or 05.15, and you’re willing to assume the above risks.
This PwnageTool also contains a 4.2.1 bundle for iPhone3G owners…for all else, it’s still only 4.1. If you have an iPhone3GS with an old bootrom, the new redsn0w will handle 4.2.1 for you (in fact it covers 4.2.1 for all devices, even though some of them are still tethered at 4.2.1 until @comex can work some untethering magic). iPhone3GS users with old bootroms who want to go to 4.2.1 should not use this PwnageTool! Update to stock 4.2.1 first, then use the upcoming redsn0w to update your baseband.
Please feel free to use our comments section for questions. We have some very knowledgeable and helpful moderators: angiepangie, Confucious, dhlizard, and Frank55!
Official Bittorrent Releases
PwnageTool 4.1.3 – PwnageTool_4.1.3_Unlock_Edition.dmg.5994102.TPB.torrent
SHA1 Sum = adda6d882dce1b5117d01586037de289407e038a
Unofficial Mirrors
The following links are unofficial download mirrors, you download these archives at your own risk, we accept no responsibility if your computer explodes or if it becomes part of a NASA attacking botnet or even worse if your hands fall off mid-way during the use of these files. We do not check these links and we accept no responsibility with regard to the validity of the files, the other content that these links may provide or with the content that is on the third-party linked site.
Always check the files that you have downloaded against our published SHA1 hash.
We would prefer that you downloaded the official bittorrent release that is linked above, but you are welcome to try these if you really must.
So, have you unlocked you iPhone yet?
Credit: Source.New Free Unlock Method for Any iPhone Emerges with a Twist, Jailbreak Required to Run SAM
TPSIM Unlock Method Lets iPhone 4S Users Use Any Carrier, Unlock Similar to Gevey SIM
Want to Unlock an iPhone 4 or iPhone 4S with SAM? It May Soon be Impossible to Do It
AT&T Now Ready to Unlock Off-Contract iPhones Following Slew of Complaints
iPhone 4S Users Advised Not to Update Smartphone to iOS 5.0.1 In Order to Maximize Chances to Unlock the Device

Tempted to upgrade the wife’s 3GS to 4, but I don’t have the time to work on it yet. Any success stories? :)
Hi when we will have the unlock for the baseband 02.10.04 for iPhone4?
guys if i stay away from this, is there a possibility of geting an unlock for my 3gs which is got bb 5.14.02…
Hi, little bit confused and stuck! hoping i haven’t screwed up again! :( i read a few posts from people saying they had unlocked their iphones (3g with BB 5.14.02)..? which is my exact phone! and i just upgraded ultrasn0w which didn’t change anything.. i’ve still got no service on my screen :( do i need to upgrade the baseband FIRST to the 6.??.?? then re-try the new ultrasn0w? i don’t really mind if i can’t update it again, will prob get rid of it soon if i can unlock it. I need to know how to update the baseband without updating my software.. i’m currently on 4.1 which should be compatible with new unlock.. Anyway, please, any help/advice would be muchly appreciated!
THANKS!
I’m so sad for the 2.10.04 baseband and would looooooooove an unlock :(
In the ipad folder above my redsnow can not find any ipsw files when I try to update from 5.14.02 to 6.15. Plus it can not extract all files bc it has two folders with the same name. Please help.
Hi Friends,
Is the Unlock software ready for the Iphone 3gs IOS 4.1 8B117 and baseband 05.14.02???????? If yes, please let me know
Has ultrasn0w released an unlock for i3Gs BB 5.14.02?
Hi Guys
Thanks to the Dev team, you guys are doing a great job.
I ran the pawnage application and followed the instructions and have ended up with the upgrade file
iPhone1,2_4.1_8B117_Custom_Restore.ipsw
on my desktop. I am stuck at this stage. I have tried to get itunes to restore using this file but it keeps trying to go online which I am sacred to let it do as thats how i ended up here. How do I get the new file to restore to my iphone?
Any help much appreciated.
hi,
when is the downgrade for the baseband 5.14 coming?
Everytime i try to restore… itune tries to verify with the apple site, and it fails….in iphone 3gs 4.1 baseband 5.14.02
@xnp
IF YOUR NOT ON 4.2.X YOUR GONNA NEED TINYUMBRELLA TO SAVE YOUR SHSH BLOBS FOR 4.1/4.0 WHATEVER…
RUN THE TSS SERVER FIRST SO WHEN ITUNES VERIFYS THE RESTORE WITH “APPLE” IT SEES THE TINY UMBRELLA SERVER AND GIVES THE OK.
iPhone 3gs 4.2.1 (8c148a) bb 06.15.00
unlocked&jailbroken with redsn0w.
@namit
never…
@brandy & suresh
no…. not yet….
hi i got iphone 4 and im running 4.2.1 i just jailbreack my iphone and is there any way i can unlocked my iphone 4? my modem firm..is 03.10.01
pls help me to fix this problem
thanks
Hi,
update ios 4.2.1 again through itunes 10.1 then jailbreak again with redsnow 0.9.6b6
run redsn0w as Administrator in “XP Compatiblity Mode”
Step 1: Download iOS 4.2.1 for iPhone 3GS or 3G.
Step 2: Update/Restore to iOS 4.2.1 firmware using the IPSW file you just downloaded via iTunes 10.1.
Step 3: Start Redsn0w 0.9.6b6 and point it to iOS 4.2.1 firmware to proceed with the jailbreak.
Step 4: Now select “Install Cydia” & “Install iPad baseband” options and then click “Next” to continue. Redsn0w will now fetch the exploitable 06.15.00 baseband from 3.2.2 firmware and will replace it the baseband in iOS 4.2.1 / 4.1.
Note: Install iPad baseband option is applicable to iPhone 3GS & 3G users only who rely on a carrier unlock.
Step 5: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.
At this stage you will be presented with a screen where you will have to quickly hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.
Step 6: Sit back and enjoy while Redsn0w will do all the rest for you. Once done, your iPhone or iPod touch will restart automatically and you will find it jailbroken on the latest iOS 4.2.1 firmware, with the unlockable 06.15.00 baseband.
For iPhone 4, 3GS (New Bootrom), iPod touch 4G / 3G / 2G, iPad ONLY:
Step 7: Now from here onwards, whenever you want to do anything related to jailbreak like SSHing into your device, or running Cydia, you must first run your device in the so called “jailbroken state” on every reboot by using “Just boot tethered right now” option in Redsn0w.
Unlock:
Once you are done with the jailbreak, you can now unlock your iPhone on any baseband using Ultrasn0w 1.2 from Cydia. To do this:
• Start “Cydia” on your iPhone.
• Touch on “Manage” tab on the bottom.
• Now touch on “Sources” as seen in the screenshot below:
• Touch on “Edit” and then on “Add”. You will be prompted to enter a url source. Type “http://repo666.ultrasn0w.com” and touch on“Add Source” to add this repo if you haven’t already.
• After installation is completed. Search for “ultrasn0w 1.2” in Cydia and install this application. This app will automatically unlock your iPhone so that you can use it with any carrier.
Now simply restart your iPhone. You should now have a fully unlocked iPhone running iOS 4.2.1!
yes
you can use ultrasn0w 1.2 and unlock…..
Many thanks for this detailed step-by-step instructional, somanadhan. I don’t doubt there will be many that will find this very helpful and I would hope they’ll voice up here by way of thanks.
Apple has gotten smarter. All along Apple found out people with iphone 3G/3GS will update to 4.1 bb 5.14.02. And many people did. And up to now, people stuck with bb 5.14.02 CAN NOT unlock. I cant believe NO ONE can unlock iphone 3G/3GS with bb 5.14.02. The so-called ‘experts’ including the dev team, say to upgrade the bb to (ipad’s) 6.15 bb, then unlock. That does NOT work either, or it appears it’ll work but then the process will just stop. People will ultimately give up. False hope is what it was. Unbelievable. Props to Apple in a way for making bb 5.14.02 unlockable forever.
GPS dont work well with iPhone 3G with FW baseband 06.15