How To Unlock iOS 5.1.1 On iPhone 4 / iPhone 3GS using Ultrasn0w Fixer for 5.1.1

By On · 5 Comments

iPhone Dev Team’s Redsn0w conveniently jailbreaks iOS 5.1.1 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 5.1.1 compatibility, you can install Ultrasn0w Fixer Patch for iOS 5.1.1.

The package, “ultrasn0w fixer for 5.1.1,” patches the iPhone Dev-Team’s ultrasn0w unlock, to work with jailbroken iPhone running iOS 5.1.1. Developed by msftguy and zmaster, ultrasn0w fixer for 5.1.1 can be downloaded by adding the repo: http://repo.iparelhos.com.

Supported modem basebands are listed below. Everything else is NOT supported.

Device Baseband
iPhone 4 01.59.00
iPhone 3GS 04.26.08
iPhone 3GS 05.11.07
iPhone 3GS 05.12.01
iPhone 3GS 05.13.04
iPhone 3GS 06.15.00

Instructions: Unlock iOS 5.1.1 using UltraSn0w Fixer for 5.1.1

Step 1: You must first Jailbreak iOS 5.1.1 firmware using Redsn0w. In order to proceed, be sure to preserve your baseband from being upgraded. To do so, create custom IPSW iOS 5.1.1. iPhone 4 and iPhone 3GS owners can use redsn0w’s “Custom IPSW” button to create a NO_BB_* version of the 5.1.1 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 5.1.1 iOS firmware to preserve Baseband

  • Launch Redsn0w, select “Extras”, and then select “Custom IPSW”.
  • Locate your iOS 5.1.1 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 5.1.1 firmware 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 5.1.1 IPSW mobile operating system.

Related posts:

  1. How To Unlock iOS 5.1 On iPhone 4 / iPhone 3GS using Ultrasn0w Fixer for 5.1
  2. Sherif Hashim Returns to Unlock baseband 02.10.04 / 04.11.08 iPhone 4
  3. iPhone Dev Team inches closer to carrier unlock iPhone 4S Baseband
  4. TPSIM: Unlock iPhone 4S baseband 1.0.14, 1.0.13, 1.0.11 without Jailbreak
  5. Here’s How to Jailbreak 5.1 iOS iPhone 4/3GS, iPod Touch 3G/4G, iPad with Redsn0w 0.9.10b6
Tagged with → •  

Like This Story? Please Share!

Like Our Site? Follow Us!

CydiaBlog on Google+
 
  • Anne

    So when v 5.1 is updated there wil any changes on 3G v 4.1 and need to upgrade again?til to the new released version 5.1?…skype previous version on 3G was lost they released a latest iOS v 4.3 which iOS v 4.1 cannot download the apps…how can upgrade directly on iPhone3g Frm 4.1 to 4.3 or above more without using desktop

  • senpost

    I have iPhone 3gs, New bootram [Year 2000, Week 52], Baseband 6.15.
    Followed everystep, but still its searching. Any tip

  • Swasthik

    u have to use the 5.1 ipsw to create custom firmware.
    5.1.1 is only used to upgrade via itunes.
    rest of the process using cydia is by using 5.1

  • Arsh

    Redsnow is not yet updated for5.1.1 . How am i supposed to preserve baseband … Redsnow does not accept 5.1.1

    • Guest

      He doesn’t know what he was talking about. Forgive him. Redsn0w doesn’t recognize yet 5.1.1 thus it cannot use custom IPSW. So this article is nil.