How To Unlock iOS 5.1 On iPhone 4 / iPhone 3GS using Ultrasn0w Fixer for 5.1

By On · 19 Comments

iPhone Dev Team’s Redsn0w 0.9.10b6 conveniently  jailbreaks iOS 5.1 firmware but does not support unlocking iPhone 4 and iPhone 3GS (on old basebands) using Ultrasn0w 1.2.5. Till the time hackers pushes out ultrasn0w unlock for iOS 5.1 compatibility, you can install Ultrasn0w Fixer Patch for iOS 5.1.

The package, “ultrasn0w fixer for 5.1,” patches the iPhone Dev-Team’s ultrasn0w unlock, to work with iOS 5.1 jailbroken iPhone. Developed by msftguy and zmaster, ultrasn0w fixer for 5.1 can be downloaded by adding the repo: http://repo.iparelhos.com. Supported modem basebands are listed below. Everything else is NOT supported.

  • 01.59.00 (iPhone 4)
  • 04.26.08 (iPhone 3GS)
  • 05.11.07 (iPhone 3GS)
  • 05.12.01 (iPhone 3GS)
  • 05.13.04 (iPhone 3GS)
  • 06.15.00 (iPhone 3GS)

ultrasn0w fixer for 5.1

Instructions to unlock iOS 5.1 using UltraSn0w Fixer for 5.1

Step 1: You must first Jailbreak iOS 5.1 firmware using Redsn0w 0.9.0b6. In order to proceed, be sure to preserve your baseband from being upgraded. To do so, create custom IPSW iOS 5.1. iPhone 4 and iPhone 3GS owners can use redsn0w’s “Custom IPSW” button to create a NO_BB_* version of the 5.1 IPSW and restore to that instead of the stock one. If you try restoring your iPhone to a stock Apple IPSW, your iPhone will be locked. If you are already running iPhone with preserved baseband, skip this step and hop to Step 2.

Steps to create custom 5.1 iOS firmware to preserve Baseband

  • Launch Redsn0w, select “Extras”, and then select “Custom IPSW”.
  • Locate your iOS 5.1 Stock firmware then the Redsn0w will run a number of background processes to create custom IPSW which is pre-jailbroken with preserved baseband.
  • Navigate to Extras > Pwned DFU and restore to your custom iOS 5.1 firmware (created in step 2) using iTunes.

Step 2: After you have successfully jailbroken your device, launch Cydia from your iPhone Springboard.

Step 3: Go to the “Manage” tab, then tap “Sources”
Step 4: Tap Edit, then Add, you should get a dialog asking for a URL
Step 5: Enter this URL: http://repo.iparelhos.com and then press ‘Add Source’.

Step 6: After the repository has refreshed and finished loading sources, Tap on the iParelhos repo to see Ultrasn0w Fixer utility.

Step 7: Select the Fixer utility, and tap on the ‘Install’ in the top right hand corner.

Step 8: Once installation is complete, go ahead and install ultrasn0w 1.2.5.

Step 9: Reboot your iPhone and your iPhone should be unlocked on latest iOS 5.1 IPSW mobile operating system.

Related posts:

  1. Sherif Hashim Returns to Unlock baseband 02.10.04 / 04.11.08 iPhone 4
  2. iPhone Dev Team inches closer to carrier unlock iPhone 4S Baseband
  3. TPSIM: Unlock iPhone 4S baseband 1.0.14, 1.0.13, 1.0.11 without Jailbreak
  4. iPhone 4S Baseband Bootrom dumped – Dev Team moves closer to successful Unlock
  5. GEVEY SIM Unlock for baseband 04.11.08 Hits Final Testing Stage
Tagged with → •  

Like This Story? Please Share!

Like Our Site? Follow Us!

CydiaBlog on Google+
 
  • valmir gonzales

    nao consigo desbloquear meu iphone 3gs 5.1 baseband 06.15.00 nao da sinal de operadora o que devo fazer  valmir_gonzales@hotmail.com

  • Mkmg76

    Got a phone that wouldnt activate, kept saying no sim installed, had been updated to 5.1 by owner, probably with standard firmware, (3gs new bootrom), jb and hacktivated it with redsnow, found that it had 06.15 BB, re-JB with custom firmware, tried ultrasn0w, wouldn’t recognise any sim, tried this fix, worked like a charm after a reboot.

  • Nikolaus Bremer

    I have IPhone 4 (Originally Locked to Telus Canada) and accidentally updated to new OS now it is with 5.1 OS and Baseband (04.12.01), I have used redSn0w to load custom firmware with no_BBS and jailbreak it and installed ultraSn0w patch first and then ultrasn0w, But i am unable to get Service it always says No Service. Any one can guide / help, I will be thankful. 

  • Hay

    when the unlock is going to be released for other basebands? i dont want to upgrade to the ipad one, im using a shitty nokia right now just because of this PLZ RELEASE AN UNLOCK SOON!

  • KT

    worked like a charm. 3GS, new bootrom, 5.13 baseband. has to uninstall ultrasn0w and reinstall after install ultrans0w fixer. thanks so much for this !!

  • Omeng c”,)

    after installing ultrasnow, it says could not activate cellular network on screen.. then I reboot via redsnow, it shows searching for 10 minutes, then the “Could not activate Cellular network” from screen then followed by no service. The sim is recognized by the iphone 3gs.. getting the signal was mainly my problem.. Please help. 

  • Rmel_cute

    the serial number of my 3gs is 88101XXX can i unlock it or can I use ultrasnow to unlock sim of my iphone it has firm ware stated above??

  • happy now

    Worked for me! Got service on my sim again
    3GS old_BR on iPad_BB 

  • lala

    I am realy happy! after days of work, i finally got to unlock my iphone 3gs iOS 5.1 and my network works great! thank you

  • Alam_che

    This works great for me. now my network works…. thanks.. by the way i am using iphone 3gs…

  • d_n

    i have an iphone 3gs on 5.1 and 6.15.00 bb…i load the ultrasn0w fixer, then ultrasn0w, just get “searching”, then reboot and keep getting “searching”…any ideas?

    • Guest

       I have the same problem! It’s driving me crazy, I can’t figure it out. Any ideas?!

      • Aj

        is your 3gs old bootrom or new bootrom

        • Rommel

          mine was new bootrom..

    • Aln3eeemi

      i have the same siuation but it works wait 10 min after reboot

  • UglyFugly

    Any chance they will make unlock for iPhone 4s ? this year ?

  • Dd

    what about iphone4 bb 04.11.08 when is it going to come out……..

  • Kskumarhai

    i did it – but still my sim card not detecting 

    please help

    –Sunil
    kskumarhai@yahoo.com