A few days ago Apple started to seed iOS 5.1.1 firmware. The new firmware update made unlocking even harder.

Ultrasn0w Unlock iOS 5.1.1

However, Gevey Ultra S can be used to unlock iPhone 4S Baseband 2.0.12 on iOS 5.1.1. Now we have another unlock news — Ultrasn0w fixer can unlock iPhone 4 / iPhone 3GS on iOS 5.1.1.

If you need to unlock your iPhone 3GS or iPhone 4 but want to update to iOS 5.1.1, you can install the ultrasn0w fixer for the latest iOS 5.1.1 firmware by reading this guide.

To Unlock iPhone 4 / iPhone 3GS on iOS 5.1.1 You Need to Know:

  • The iPhone 3GS or iPhone 4 on iOS 5.1.1 must have a preserved baseband and must be jailbroken. You can build a custom firmware with the same tool or jailbreak it using the latest redsn0w version.
  • To Download UltraSn0w Fixer 5.1.1 (Deb files) click here.

Unlock iPhone 4 baseband on iOS 5.1.1

Ultrasn0w Fixer Unlock iPhone 4 iOS 5.1.1

Ultrasn0w Fixer for iOS 5.1.1 Supported Basebands:

  • iPhone 4 — 01.59.00 Baseband
  • iPhone 3GS — 04.26.08 Baseband
  • iPhone 3GS — 05.11.07 Baseband
  • iPhone 3GS — 05.12.01 Baseband
  • iPhone 3GS — 05.13.04 Baseband
  • iPhone 3GS — 06.15.00 Baseband

Unlock iPhone 4 / 3GS on iOS 5.1 with Ultrasn0w Fixer:

  • Step 1: You need to Download DiskAid for Mac or i-FunBox for Windows.
  • Step 2: Open one of them and go to /private/var/root/Media
  • Step 3: Create a folder called Cydia inside the Media folder.
  • Step 4: Now inside the Cydia folder, create an AutoInstall folder. The name of the folder is case-sensitive so be sure to same it correctly. Here is what it should look like:  /private/var/root/Media/Cydia/AutoInstall
  • Step 5: Now open downloaded (UltraSn0w-FIXER-iOS-5.1.1.rar) file and extract ultrasn0w_1.2.5.deb, com.zmaster.ultrasn0wfixer_1.0_iphoneos-arm.deb and mobilesubstrate_0.9.3997_iphoneos-arm.deb to AutoInstall folder.
  • Step 6: Reboot the iPhone, you should know its currently boot tethered! So open redsn0w -> Extras -> Just Boot.

The Utrasn0w fixes are made by unknown hackers, so to play safe, you can wait for the official ultrasn0w update. Add UnlockBoot in your circles for more unlock updates!

  • hoti

    does it work for Iphone 4 5.0.1 bb4.11.08

  • Cindy HeHe

    Does it work for iphone 5.1. bb4.12 …Really need to get this unlock!! HELP HELP

  • Ruta507

    Please pay attention and READ before ask dump questions!!!!!, PEOPLE DONT LIKE TO READ.

  • Spam1024

    5.1.1 baseband 4.12.01 this is challenge 😛 as far nobody did it

  • reda2006

    i am fed up ***************************************************************************************************

    i have an iphone 4 BB 04.11.08

    if i do the update to 5.1.1

    and use the UltraSn0w Fixer

    is it going to unlock my iphone 4 04.11.08

    please advise

    and thank you

  • Victor_ame13

    You are asking? Or you are claiming works for iPhone 4 baseband 04.08.11

  • Tri Three104

    I got my new iPhone 4s using precious ticket from iPhone 4 now my iPhone 4s work like factory unlock use any GSM card MD270LL

  • Rosen_

    You are sleeping too much if you realy want to unlock your phone.I have locket iphone to AT&T nao i can use only with one sim card with SAM i read every day all new about unlock…

  • Goldo169

    So you need to wake up buddy and don’t take it the wrong way because I have a AT&T iphone 4s that I won on e-bay and it was locked too. I unlocked it with Gevey Ultra S and my iphone is running on T-Mobile. It takes less than 1 min. to unlock

  • Goldo169

    Have you tried the redsn0n website or Devteam site. They always have any updated on jailbreak or unlocking iphone’s


    you have 4s not 4 ! and your iphone baseband not 04.11.08, so gevey don’t work on iphone 4 with baseband 04.11.08!

  • kmikesch

    Hello, i can not unrar the deb files – i have no password

  • dan

    does it work on iphone 3gs – bb 05.16.05 ? ty

  • Emdad

    I did it bro ! I have unlocked my iPhone 4 iOS 5.1.1 baseband 4.12.1.Just e mail me to get procedure (voyager_khl-at-yahoo.com)

  • jerry

    how did u do it? i followed all the steps but it keeps on searching for the carier

  • Younas Abdulrazzaq

    i have the same iphone with same specs please help me with it

  • Jason Buñag

    can you send me the procedures thanks

  • Tinwa

    I also have the same iPhone 4 based band 4.12.01 also. please e-mail procedure to me. Thanks a lot

  • ronak

    plz email me procedure -at- ro_naik05-at-hotmail.com…..plz …..thanks…

  • Anas S. Haimour

    please send me the procedure i have 5.1.1 and baseband 04.12.01

  • louiejay69

    please email me too. plsssssss…. louiejay69-at-yahoo.com

  • wicky

    please send me the procedure i have iphone 4 ios 5.1.1 and baseband 04.12.01
    thanks in advc

  • izzy

    Can you please email me the procedure?! I would greatly appreciate it.
    heres my email: kobe24zero-at-hotmail.com

  • ihseno

    s’il vous plaît envoyez-moi aussi la procédure que je l ‘iphone 4 ios 5.1.1 et baseband 04.12.01
    mon e-mail: ihseno-at-yahoo.com

  • Karloz

    well I goota say that I unlock my iPhone 4 running on 5.0.1 basaband 04.11.08 with SAM on 06/24/12 :))))

  • Jay

    Can you please email me what you did to unlock it. It would really help.
    email – yaboyscoobz-at-gmail.com

  • Meshal

    I didnt work for me! plz help

  • Katie

    could you email me the procedure? wldcalstarcheer-at-yahoo.com

  • wchotchum

    please send me the procedure.I have 5.1.1 and baseband 04.12.01


  • Titha

    Did you get it? Can you unlock yours now?

  • Tinwa

    didn’t get it. Still can’t unlock. Try IMEI unlock. heard it work.

  • Donna

    could you email me the procedure please? wahini1109-at-yahoo.com
    Thanks so much!

  • Ruby

    can you e-mail me the procedures~thanks a lot!!!

  • marko

    could you email me the procedure please? shpi-at-live.co.uk .com
    Thanks so much!

  • franck

    qui peut m’aider à desimlocker mon iphone 4 version 5.1.1 baseband 4.12.01 de o2 mobile

  • Roque

    can you please e-mail me the steps thanks

  • AndyPoundy

    can you e-mail me the procedures thanks (andykoomson2005-at-yahoo.co.uk)

  • Gregg Shepherd

    Hey man please help. Have jailbrocken my iphone4(5.1.1 – 4.12.01 ) please help
    Me unlock it nothing works for me!!!
    Thanks Gregg S

  • mgilot

    please send me the procedure.I have 5.1.1 and baseband 04.12.01 iphone4 (just email me at mgilot85-at-gmail.com)

  • Greg J

    I have Baseboard or Modem Firmware 04.12.01 How can I get this phone unlocked for when I travel? Thanks Much!

  • Nicky Ng

    Email me the procedure please. i have 04.12.01.

  • Berty007

    Can you please send me the procedure. I have 5.1.1 and baseband 04.12.01 with Orange UK.
    Thanks veeeeery much.

  • Berty007

    oups….. please send to:

  • rizwan

    Hi guys , please email me the procedure to unlock ios 5.1.1 bb 04.12.01 at rizwananwar06-at-gmail.com

  • pratik

    I have jeilbreck my iphone 4 with redsnow and my ios 5.1.1 baseband 04.12.01 and i want to unlock my iphone 4 sow please give me aa way for unlock pleeeeeeease my email is pratikchudasama13-at-gmail.com

  • Stef

    My Iphone4 is IOS 5.1.1 baseband 04.12.01, jailbroken but I can’t unlock it. Any chance to get the procedure to unlock it. Thanks. stefanoelviri-at-yahoo.ie

  • hamid

    Email me the procedure please. i have 04.12.01 hamid01716-at-gmail.com please hellp me

  • manuman

    dont work for me on ipad bb just searching no service