Sat. Jun 19th, 2021

How to Unlock iPhone 4 (Old Baseband) and iPhone 3GS On iOS 4.3.3 Using Ultrasn0w 1.2.3

With the release of Redsn0w rc15 and PwnageTool 4.3.3 for iOS 4.3.3 Jailbreak, iPhoen dev team has also released an update version of ultrasn0w to unlock iPhone 4 /3GS basebands on latest released iOS 4.3.3 firmware. This update of ultrasn0w 1.2.3 does not unlock new baseband it just to unlock all the recent unlocked iPhone basebands.

Unlock iOS 4.3.3 with ultrasn0w 1.2.3

Please note:

  • · Ultrasn0w works for basebands (01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00)
  • · Ultrasn0w is NOT compatible with the following basebands! (02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04)


First of all jailbreak your device with PwnageTool or Redsn0w on iOS 4.3.3, head to these simple steps to unlock your iPhone 4, iPhone 3GS running on iOS 4.3.3 with ultrasn0w 1.2.3.

Step 1: Open Cydia from Springboard and go to manage tab than give a tap on sources to add the ultransn0w repo:


If the source is already added just go into changes and wait for it to Load. when it is done it will show you the updates.

Step 2: Open Ultrasn0w and download it


Once its installed, it will simply ask you to reboot your iPhone, after rebooting process you will surely be on carrier unlocked iPhone 4 /3GS.