Ultrasn0w 1.2.2 has been released by iPhone Dev Team to unlock iPhone 4.3.2 by using Ultrasn0w. This Ultrasn0w updated version specially released to unlock 4/3GS running on iOS 4.3.2 with old baseband.

The latest release of UltraSn0w does not support new basebands, it only fixes compatibility issues with already-unlocked iPhones. In this tutorial, we’ll show you how to install the latest version of UltraSn0w to unlock your iPhone running iOS 4.3.2.
Compatible basebands:
01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00
Incompatible basebands:
02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04 / 05.16.02
How to Unlock iOS 4.3.2 using Ultrasn0w 1.2.2?
STEP 1: In order to unlock iPhone 4 4.3.2 by using ultrasn0w, your iPhone 4/3GS must be jailbroken on iOS 4.3.2 and preserve the old baseband by using either Sn0wbreeze for Windows or PwnageTool for Mac.
- how to jailbreak iOS 4.3.2 using PwnageTool
STEP 2: Now after the first step now you can unlock your iPhone on the supported basebands using Ultrasn0w 1.2.2.
- Launch “Cydia” on your iPhone
- Now Touch on “Manage” Tab and in Manage you will see see “Source” touch on it also.
- Now touch on “Edit” and then ” Add”
- Now you will have to enter URL Source, here your will type: “http://repo666.ultrasn0w.com” then touch on Add source button.
STEP 3: Cydia will do following a series of automated steps
- Wait for installation completion.
- Search for “ultrasn0w 1.2.2” in Cydia and install the app. After installation this Cydia app will automatically unlock your iPhone.
STEP 4: Restart your iPhone and now you have unlocked iPhone 4/3GS on iOS 4.3.2.