Unlock iOS 5.0.1 Baseband On iPhone 4 / 3GS Using Ultrasn0w 1.2.5 [How to]

by Jawwad in Guides, iPhone, Mobile | 2 comments

Unlock | Unlock iOS 5.0.1 Baseband On iPhone 4 / 3GS Using Ultrasn0w 1.2.5 [How to]We have been waiting for this for quite some time and recently iPhone Dev-Team has released an updated version of the Ultrasn0w 1.2.5 for unlocking the baseband of your iPhone 4/3GS that have been upgraded to the new iOS 5.0.1. Earlier version of the Ultrasn0w was not compatible with iOS 5.0.1.  It should be emphasized that this is NOT a new unlock for the new basebands but only provides the unlock support for the existing baseband namely: 01.59.00 for iPhone4 and 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00 for iPhone 3GS.

Here is a guide of unlocking the iOS 5.0.1 on iPhone3GS and iPhone 4 using the Ultrasn0w 1.2.5 after jailbreaking it using tools like Sn0wbreeze (Windows only) or Redsn0w (Windows & Mac) both allow to preserve the baseband of your device for a future unlock using Ultrasn0w.

iOS 5.0.1 Untethered Jailbreak Guide

If your device is not jailbroken on latest iOS 5.0.1 then please follow our recent detailed guide to preserve the baseband while doing so for both Windows and Mac. It will not only preserve the baseband but also provide the untethered jailbreak i.e., no need to connect your device to the PC to get it booted after rebooting anymore on iOS 5.0.1.


Now we move to the actual process:

Step 1: First you need to be jailbroken on iOS 5.0.1 as mentioned above. Follow our guide to do jailbreak iOS 5.0.1 using latest Redsn0w (on Windows and Mac) [see links above for the guide].

Step 2: Once jailbroken, you need to unlock the iPhone 4/3GS using the Ultrasn0w 1.2.5.

  • Load Cydia on your iPhone.
  • Push the Manage tab at the bottom.
  • Now push on the Sources.

iPhone4Unlock11 | Unlock iOS 5.0.1 Baseband On iPhone 4 / 3GS Using Ultrasn0w 1.2.5 [How to]

Step 3: Now tap on the Edit and then tap on Add. Now you will get a prompt to enter a URL source (see the screenshot below). Type the http://repo666.ultrasn0w.com and tap on Add Source to add this repo if you haven’t already.

iPhone4Unlock21 | Unlock iOS 5.0.1 Baseband On iPhone 4 / 3GS Using Ultrasn0w 1.2.5 [How to]

Step 4: Cydia will now automatically update your sources by following a series of automated steps.

Step 5: When the installation is complete search for “ultrasn0w 1.2.5” in Cydia, and install it. It will automatically unlock your iPhone so that you can use it with any carrier without any further action and you should now have a completely unlocked iPhone 4 or 3GS, running iOS 5.0.1!

If you want to jailbreak iOS 5.0.1 on your iDevice and not concerned about preserving the baseband of your iDevice then please follow our guide that we posted earlier today:

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