iH8sn0w had released Sn0wbreeze 2.5.1 few weeks back, which allows users who want to jailbreak and also unlock their iPhone to update their iPhone with a pre-jailbroken iOS 4.3.1 while preserving the baseband from getting upgraded so that it can be unlocked using Ultrasn0w.This guide will provide iPhone 4 and iPhone 3GS users with step-by-step instructions to update and jailbreak their iPhone with iOS 4.3.1 while preserving their iPhone's baseband. Some important points before the step-by-step instructions:Please note that jailbreaking your iPhone may void its warranty so proceed with caution.Don’t forget to backup your iPhone before you proceed. You can refer to this post for instructions on how to backup your iPhone.Please ensure that your iPhone has enough charge.This guide is only for iPhone 4 and iPhone 3GS users.iPad, iPod Touch and iPhone users who don't care about unlocking or preserve their iPhone's baseband can use Redsn0w to jailbreak their iOS device on iOS 4.3.1 as it is a lot easier.Sn0wbreeze is only works on Windows. Mac OS X users should use PwnageTool. Checkout this step-by-step guide.Users who want to unlock their iPhone:Sn0wbreeze does not unlock your iPhone.You can use Ultrasn0w to unlock your iPhone after you have successfully updated and jailbroken your iPhone with iOS 4.3.1.But there is a catch. Ultrasn0w 1.2.1 can only unlock the following basebands (you can check the baseband by going to Settings –> General –> About –> Modem Firmware):iPhone 4 baseband - 01.59.00iPhone 3GS basebands - 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00.So if your iPhone is currently on baseband mentioned above then Sn0wbreeze will allow you to create a custom pre-jailbroken iOS 4.3.1 and preserve the baseband so that you can unlock your iPhone using Ultrasn0w 1.2.1.If you accidentally upgraded your iPhone 4 with iOS 4.3.1/iOS 4.3/ iOS 4.2.1/ iOS 4.1 then its baseband would have got upgraded to 02.10.04/ 03.10.01/ 04.10.01. Unfortunately, 02.10.04, 03.10.01, 04.10.01 basebands for iPhone 4 cannot be unlocked nor can it be downgraded currently.Similarly, if you accidentally upgraded your iPhone 3GS with iOS 4.3.1/iOS 4.3/ iOS 4.2.1/ iOS 4.1 then its baseband would have got upgraded to 05.14.02/ 05.15.04/ 05.16.01/ 05.16.02. Unfortunately, 05.14.02, 05.15.04, 05.16.01, 05.16.02 basebands for iPhone 3GS cannot be unlocked nor can it be downgraded currently.After the jailbreaking process is complete, do not forget to checkout our article on tips to keep your iPhone secure. Also, remember to change the password of your jailbroken iPhone.Please read the instructions carefully especially the ones highlighted in bold.If you meet the requirements mentioned above then you can proceed with the step-by-step instructions to jailbreak your iPhone using Sn0wbreeze.Step 1: Download Sn0wbreeze 2.5.1 from here and save it in a folder named "Sn0wbreeze" on your desktop.Step 2: You also need to download the iOS 4.3.1 firmware file (use Firefox or Chrome to download the firmware file instead of using Internet Explorer or Safari):iOS 4.3.1 firmware file for iPhone 4 users (iPhone3,1_4.3.1_8G4_Restore.ipsw)iOS 4.3.1 firmware file for iPhone 3GS users (iPhone2,1_4.3.1_8G4_Restore.ipsw)Step 3: Extract Sn0wbreeze from the zip file. Double click on the Sn0wbreeze icon to launch the application. You will get a dialogue informing you that the software is not for commercial use. Click OK button to continue. Then the Credits dialog box, click on the Close Credits button to continue.Step 4: Click on the blue arrow button at the bottom right side to proceed.Step 5: Click on the browse button and select the appropriate firmware file that you had downloaded in step 2 (iPhone 4 users: iPhone3,1_4.3.1_8G4_Restore.ipsw, iPhone 3GS users: iPhone2,1_4.3.1_8G4_Restore.ipsw) .Step 6: Sn0wbreeze will verify the firmware file. Once the firmware file is verified, it will you inform you that the IPSW is verified and also the iPhone model. You will be able to click on the blue button to proceed. For iPhone 3GS users, it will request you to select whether your iPhone 3GS comes with the old or new bootrom. If you don't know, click on the Detect it for me button. You need to connect your iPhone and follow the on-screen instructions.Step 7: After selecting the bootrom, you will be prompted with three options:Baseband Preservation ModeSimple ModeExpert ModeSelect Expert Mode and then click on the blue arrow. Note all modes preserve the baseband so you can also select the Simple Mode. Baseband Preservation Mode will only update your iPhone to iOS 4.3.1 while preserving the baseband but won't jailbreak your iPhone.Step 8: Select General and then click on the blue arrow.Step 9: Here you will get an option to select various options such as:Enable battery percentageEnable Gestures Menu - this is pre-selected and for multitouch gestures that is only available to developers currently)Activate the Phone (Hactivate) - select this option if you don't use an official carrier SIMAfter selecting appropriate options, click on the blue arrow.Step 10: In the next screen, you will get an option to download apps from your favorite repos, you can skip this step and click on the blue arrow button.Step 11: Now click on Build IPSW and click on the blue arrow button.Step 12: Sn0wbreeze will now start creating the custom firmware file, which takes 5 to 6 minutes. You will get an option to play PacMan during this time.Step 13: Once the custom firmware file is create, you will get a message that the custom firmware has been successfully creation and prompted with an OK button to put your device in a restorable state. Sn0wbreeze creates the custom firmware file on your desktop and prefix it with sn0wbreeze. So it will create sn0wbreeze_iPhone 4-4.3.1.ipsw for iPhone 4 users and sn0wbreeze_iPhone 3GS-4.3.1.ipsw file for iPhone 3GS users.Step 14: Turn off your iPhone and connect it to the computer and follow the on-screen instructions to put your iPhone in DFU mode using Sn0wbreeze:Hold Power and Home buttons for 10 secondsNow release the Power button but continue holding the Home button for 10 more secondsYou device should now be in DFU modeStep 15: If you've followed the steps correctly, you should get a message that your device is in a PWNED DFU state (black screen).Step 16: iTunes will now prompt you with a message that reads "iTunes has detected an iPhone in recovery mode". Press OK. Your iPhone is now in recovery mode.
Step 17: While on the iTunes window, hold the Alt/Option SHIFT key and click on the 'Restore' button. (This is a VERY IMPORTANT STEP as just pressing the "Restore" button will result in restoring your iPhone with the latest firmware, which is iOS 4.3.1 firmware currently, by holding down Alt/Option button, allows you choose the custom iPhone firmware file).
Step 18: Navigate to the Pwnage folder on your desktop and select the custom IPSW file (REMEMBER the custom firmware file with sn0wbreeze prefix) that was just built (and NOT the original firmware file). Click on the 'Choose' button to proceed.Step 19: iTunes will now restore the custom firmware on your iPhone. The process will take up to 10 minutes. Once it is completed, your iPhone will reboot and should be updated with iOS 4.3.1. It should also be successfully jailbroken and you should find Cydia jailbreak app on your iPhone’s home screen.If you're new to the jailbreaking world and wondering what to do after jailbreaking your iPhone, checkout our jailbreak apps category page to find out the apps you can install on your iPhone using the Cydia app.Update:Updated the post to use the Expert Mode.If you observe the single signal bar issue after successfully jailbreaking your iPhone, install Ultrasn0w 1.2.1 by following the step-by-step instructions mentioned here.We hope you found this tutorial useful. Please let us know how it goes in the comments below.TweetShareRelated PostsHow To Jailbreak Your iPhone 4, iPhone 3GS Using PwnageTool For Mac (iOS 4.3.1)How To Jailbreak iPhone 4, iPhone 3GS On iOS 4.3.1 Using Redsn0w [Windows / Mac]How To Jailbreak Your iPhone 4, iPhone 3GS, iPhone 3G Using PwnageTool (iOS 4.2.1)How To Jailbreak Your iPhone 4, iPhone 3GS or iPhone 3G Using PwnageTool (iOS 4.1)Sn0wbreeze 2.5 For Windows: Untethered iOS 4.3.1 Jailbreak For iPhone, iPad And iPod Touch ReleasedPosted by iPhoneHacks on April 10, 2011 in Jailbreak iOS 4.3, Jailbreak iOS 4.3.1, Jailbreak iPhone, Jailbreak iPhone 3GS, Jailbreak iPhone 4, Jailbreak iPhone 3G, Sn0wbreeze, iPhone 3GS, iPhone 4, iPhone Guides, iPhone Tutorials | Permalink|Comments (57) Comments 
super said... what is the best way to upgrade(jailbreak and unlock) iphone 3gs with 4.1 and DB 5.14.02.?
April 10, 2011 at 8:32 PM Reply
Armin said... Well, for nowit’s sn0wbeeeze since you need to preserve your modem firmware to whatever mentioned above, for the ultrasn0w to work from cydia.
April 10, 2011 at 8:39 PM Reply Armin said... Great instucction very detailed and informative.
However, if the iOS 4.3.2 is comIng out in a week or so, apparently to fix some bugs, shouldn’t we wait for the next release than jailbreak !
Yep said... For anyone interested, I just saw on Sherif Hashims twitter he is using the Gevey sim card. Even though he retweeted the fact it is illegal. I guess thats a bad sign when a “baseband hacker” is using an illegal sim card spoofer.
He said its only because people were asking about it. I think he is just getting ready to say they can’t unlock the i4. That’s ridiculous.
April 10, 2011 at 8:38 PM Reply
Lee said... Hello everyone I have a question.
For those ppl had updated their baseband to
6.15 and they r on 4.1 FW can they still update
To 4.3.1 using redsnow or pwnageTool IPSW firmware?
Ahmed Saeed said... Thanks but i upgraded my iphone 3gs from 4.1 to 4.3.1 by redsn0w.9.6rc9 and works like charm
April 10, 2011 at 10:00 PM Reply
Kyle said... Anyone have experience with Rebel or Gevey Simms? I can’t wait for an unlock any longer. Do tell.
April 10, 2011 at 10:22 PM Reply
Hack-is-good said... Hi guys,
I’m running 4.2.1 and 6.15.00 baseband on a 3GS. I desperatly need to get off this baseband. Can this tool help me downgrade my bb? I’m having horrible battey issues even after SAM prefs. My phone never lasts more than 6 hours with minimal usage.
Please Help..
pat said... hello, question got a 3gs jail-broken with jailbreak me for OS 4.0 would like to upgrade to 4.3.1 Can I do that with snowbreez I’m using windows baseband 05.13.04 and if would I lose all my apps???
April 10, 2011 at 10:48 PM Reply
kd said... is this suppose to work an iphone4 with 4.0.1 that’s already jailbroken and unlocked? i tried doing this but itunes keep getting error after it says preparing to restore.
April 10, 2011 at 11:21 PM Reply 0ooo said... 1600 code during the iturn store…
April 10, 2011 at 11:59 PM Reply
iPhoneHacks said... Use iREB to fix the 1600 error:
http://www.iphonehacks.com/2011/02/how-to-fix-1604-1603-1602-1601-1600-error-while-restoring-custom-ios-4-2-1-ipsw-firmware-file-using-ireb.html
DiabloZoe said... The tutorial is not exactly right!! All modes of SB preserve your baseband!!! Expert Mode will allow you to add cydia packages and boot logos and change the root size! The preserve BB option just updates your phone and keeps the BB at the lower BB but does not JB
April 11, 2011 at 7:31 PM Reply DiabloZoe said... The BB pres mode is also for people that want to JB with Redsnow! IphoneHacks please revise the Tutorial!
April 11, 2011 at 7:34 PM Reply iPhoneHacks said... We have updated the post. Thanks for pointing it out.
April 11, 2011 at 7:44 PM
Mayor McCheese said... Just followed the instructions to the letter. After phone restored, I got the itunes, and cable thing, then I placed my old AT&T sim in the phone to get it past the emergency screen, and NO CYDIA is there.I have an iPhone 4 GSM and my modem version IS at 1.59.00, but no Cydia. How can I get Cydia on here?? I’m stuck..
April 11, 2011 at 12:42 AM Reply
there's a fix for this said... Ok, now that you ran it and created the custom firmware to preserve your baseband, you need to run through the process again and select “General” this time around. You’ll see Cydia after this. I ran into the same ordeal. Lemmy know if it works.
April 11, 2011 at 4:42 PM Reply Mayor McCheese said... Thanks for the help. Actually, I got impatient last night, and I just ran Redsn0w, and took care of it. Thanks though, I really appreciate the reply.
April 11, 2011 at 4:51 PM Reply
Snidley Whiplash said... why is sn0wbreeze file only ever on hotfile? I can never get it to download.Is there a reason for this? Just hangs? is that because every bastard is trying to download it.Why not spread the load over different file servers?
April 11, 2011 at 1:49 AM Reply
Dev said... Can’t seem to download from Hotfile site, just keeps getting stuck, wish there was a mirror somewhere.
April 11, 2011 at 6:49 AM Reply DiabloZoe said... Just hit dl again!
April 11, 2011 at 9:52 PM Reply Little said... After the Step 14, iphone wouldn’t reboot, it just stays black screen. iturn still in DFU. i have tried a few times, it didn’t work.
April 11, 2011 at 3:30 AM Reply iPhoneHacks said... We’ve updated the post, please try again.
April 11, 2011 at 7:47 PM Reply
Gus said... I’ve had the same problem, so I tried using expert mode and then select BUILD IPSW and it worked for me so hopefully it’ll work for you as well.
April 12, 2011 at 12:52 AM Reply Little said... Thanks Gus, i just tried your way, and it worked.
April 12, 2011 at 1:31 AM Reply
Karthik said... @ Little
the instructions above is wrong 
DF said... No Cydia Installer, updated to iOS 4.3.1 / Baseband 1.59.00 using Sn0wbreeze 2.5.1. Any clues?
April 11, 2011 at 6:17 AM Reply there's a fix for this said... Ok, now that you ran it and created the custom firmware to preserve your baseband, you need to run through the process again and select “General” this time around. You’ll see Cydia after this. I ran into the same ordeal. Lemmy know if it works.
April 11, 2011 at 4:43 PM Reply Karthik said... Didn’t work.. Now going back to 4.0.. Will try jailbreaking to 4.3.1 again after downgrading to 4.0
April 11, 2011 at 6:31 AM Reply Karthik said... it worked 
Canadian boys said... It not work for me
Little said... How can you downgrade to 4.0?
the new Sn0wbreeze doesn’t work.
Rob said... I followed the directions above, but when trying to use snowbreeze 2.5.1 with the 4.3.1 ipsw file, it just fails and says that it can’t create an ActiveX control. Any ideas as to why, or how to fix it?
April 11, 2011 at 7:08 AM Reply Dev said... The problem is Step 7 you should chose Simple Mode that will install Cydia all modes preserve baseband as the window in Snowbreeze says.
April 11, 2011 at 2:05 PM Reply
Kb said... I have the “1 bar” signal problem. Is there a fix?
April 11, 2011 at 3:50 PM Reply iPhoneHacks said... If you observe the single signal bar issue after successfully jailbreaking your iPhone, install Ultrasn0w 1.2.1 by following the step-by-step instructions mentioned here:
http://www.iphonehacks.com/2011/04/ultrasn0w-1-2-1-to-unlock-for-iphone-4-iphone-3gs-on-ios-4-3-1-released-also-fixes-signal-bar-issue.html
jOEY said... IF I UPGRADE TO 4.3.1 DO ALL OF THE CYDIA APPS STILL WORK?? FACEBREAK? OR MY3G? OR IFILE? ARE THEY WORKING ON THE NEW FIRMWARE??
April 11, 2011 at 10:36 PM Reply Gus said... I followed all instructions, but when iTunes asked me to keep my phone connected after the process was complete and that it’ll restart in 10 sec the phone stays in DFU Mode but the phone does not power on at all. I had 4.0 firmware and BB 05.13.04 using windows 7 64bit. Please help!!
April 11, 2011 at 11:32 PM Reply
Ron said... Hi Gus,
I have exactly the same problem and my iPhone 3GS have the old bootroom.
I read about this DFU loop problem and apparently I have to wait until the battery is fully drained. Actually I’ll wait for 5 or 7 days to try again because the other option is to disconnect the battery for 30 minutes and seams to be a dangerous procedure.
Please let me know if you or anyone have the same problem and solve it with any procedure.
Regards
Matt said... did the process described above, and it worked like a charm! Many thanks!
April 12, 2011 at 12:35 AM Reply
Anthony said... I used sn0w to jb and preserve my unlock ip4. Problem with 1 bar Fixed but for some reason I cannot receive or send mms? I’m on att in USA baseband. 1.59 and 4.3.1? Any ideas? Please help if you know of a solution. Thanks for your time
April 12, 2011 at 4:04 AM Reply
giangawa said... you wrong when restore custom firmware by itunes on windows,
Press SHIFT
NOT
ALT
April 12, 2011 at 6:36 AM Reply
lee said... Error code 1600, What do i do?
April 12, 2011 at 8:20 PM Reply lee said... sorry, more info. Error 1600 when trying to restore with itunes
April 12, 2011 at 8:23 PM Reply iPhoneHacks said... It looks like you have not put the iPhone in the pwnaed DFU mode properly. Try the process again and follow the instructions carefully.
April 12, 2011 at 8:37 PM Reply
ben said... I have a 3.1.3 iphone 3gs, jbroken, unlocked, with bb 05.12.01.
how should i do to upgrade to 4.1.3 and keep my jb and unlock ?
on cydia in green i have “shsh:ios 3.13, 4.0, 4.0.1, 4.0.2, 4.1, 4.2.1+”
thank you
iPhoneHacks said... You can follow this guide to update your iPhone 3GS with pre-jailbroken iOS 4.3.1 and also preserve the baseband (keep it at 05.12.01) so that you can install Ultrasn0w to unlock it.
Please read the instructions carefully especially the ones highlighted in bold.
April 12, 2011 at 10:57 PM Reply ben said... Which mode should i use ? expert ?
April 13, 2011 at 5:15 AM Reply ben said... my phone is already unlocked, will this process lock it first?
April 13, 2011 at 6:04 AM Reply
Bruno said... Hi, it didn’t work for me… when I select custom IPSW the itunes said an error 21… what should I do?? I did with the expert mode…
April 13, 2011 at 2:41 AM Reply
il Santi said... Maybe this is an old (stupid) question but… Is it safe to do a “Shift+Update” on iTunes with custom IPSW to prevent erasing music, videos and installed apps? Either how could I prevent installed apps from being deleted? (Installous, Twitter, Angry Birds and savegames, scores, configuration, the whole thing)…
April 13, 2011 at 4:47 AM Reply
M N said... Hi I JB my iphone 3gs and I get some errors. First my iphone is crashing for no reason. The second thing is that my wi-fi is grayed out. Is this hardware damage?
April 13, 2011 at 12:20 PM Reply il Santi said... Guys, you must be more specific. Provide Jailbreak tool used, firmware version installed as minimum.
April 13, 2011 at 4:06 PM Reply Lee said... Im trying to jailbreak my 3gs and ive downloaded the firmware for 3gs and then extract the file but it is just a folder and not a .ipsw file. I tried chaning it to a .ipsw so snowbreeze would reconise it but it didnt work. please can someone point out what i am doing wrong?
April 13, 2011 at 2:59 PM Reply
Dogger said... after attempting to restore in Itunes I receive an error code 17. says it can’t be restored and returned the Iphone 3gs to the screen telling to plug into itunes.
April 13, 2011 at 10:49 PM Reply
jagl said... hello i have a I4 and the bb is 04.10.01 is possible unlock, or what i have to do pls help me
April 13, 2011 at 11:38 PM Reply
Momo said... Hi,
I am having a issue after using ultrasnow to unlock my iPhone 4 …. My baseband is 1.59… After using ultra snow signal bar issue is fixed but network data is not working .. I mean by when I use safari no Internet connection..
But when uninstall unltrasnow Internet works…
Is it me or others are having also…
Plz help me out
Thanks…
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