How to Unlock iPhone 4 iOS 5.0.1

Follow the tutorial below to create custom iOS 5.0.1 ipsw file and use it with Redsn0w 0.9.10b1 and PwnageTool to unlock your iPhone 4 using Ultrasn0w 1.2.5 available for free in Cydia.  Unlock available for supported baseband only ( list at the bottom ) . This tutorial will also come in handy for Gevey Sim users who need to preserve their old baseband 04.10.01 for unlock .

Method 1 : Redsn0w Baseband Preservation Method

Steps to create custom iOS 5.0.1 ipsw and Unlock iPhone 4 – Redsn0w:

  1. Download Redsnow 0.9.10b1 redsn0w ios 5.0.1 untethered jailbreak
  2. Download iOS 5.0.1 ipsw file
  3. Launch Redsn0w.exe app in “Administrator Mode” .
  4. Click Extras > Custom IPSW and select the iOS 5.0.1 ipsw file downloaded in Step 2
  5. Redsn0w will now create a custom ipsw file for your device and save it as “no_bb” as a prefix for the file name.
  6. Turn off your iPhone and use Redsnow > Extras > Pwned DFU to put your device in recovery mode
  7. Launch iTunes and press SHIFT + Restore and select the custom ipsw created in Step 5
  8. iTunes will upgrade your phone to iOS 5.0.1 preserving its baseband .
  9. Now follow the Redsn0w tutorial here to jailbreak your iPhone .
  10. After jailbreak is complete unlock your iPhone 4 , iPhone 3GS using Ultrasnow 1.2.5 .

Method 2 : PwnageTool Baseband Preservation Method

  1. Download PwnageTool for iOS 5.0.1 pwnage tool jailbreak iphone 4 4.3.1
  2. Launch the application on your Mac and select your iOS device ( iPhone 4 in this case)
  3. Now PwnageTool will search and find your iOS firmware (iOS 5.0.1) . If it is unable to find the firmware , choose “Expert” mode and browse the ipsw file downloaded from Apple servers (link) .
  4. Now click on “Build” to create the custom IPSW for your device. pwnageTool ios 4.2.1 iphone 4 jailbreak
  5. Follow on-screen instructions to put your device in DFU mode (Pwned DFU) for restore with iTunes .
  6. Launch iTunes and select the custom ipsw file created by PwnageTool .
  7. To do this you have to press and hold Option + Restore button and select the custom firmware
  8. Itunes will now restore and jailbreak your device while also preserving its baseband for unlock with Ultrasn0w and Gevey Sim .

Note : The Ultrasnow 1.2.5 unlock works for the following supported basebands of iPhone 4 and iPhone 3GS . iPhone 4S unlock is not available yet .

  • 01.59.00
  • 04.26.08
  • 05.11.07
  • 05.13.01
  • 05.12.01
  • 06.15.00

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