Sunday, April 10, 2011

Ultrasn0w 1.2.1 to Unlock 4.3.1 iOS on iPhone 4 & 3GS Released Fixes No Signal Bar Issue

Ultrasn0w 1.2.1 to Unlock 4.3.1 iOS on iPhone 4 & 3GS Released Fixes No Signal Bar Issue

Posted: 09 Apr 2011 09:38 PM PDT

At a time when dev team had released Redsn0w 0.9.6rc9 & PwnageTool 4.3 untethered 4.3.1 jailbreak tool we had warned users not to jailbreak if they rely on unlock. Though there is no new unlock available which can unlock iPhone 3GS basebands 05.14.02, 05.15.04, 05.15.04, 05.16.01 & 05.16.02 or iPhone 4 Baseband 02.10.04, 03.10.01, 04.10.01 but the existing Ultrasn0w 1.2 is broken on iOS 4.3.1 hence those users who attempt to preserve baseband using PwnageTool 4.3 or Sn0wbreeze 2.5.1 will not be able to use Ultrasn0w to unlock.

Finally today iPhone Dev team has released a fixed version of Ultrasn0w, Ultrasn0w 1.2.1 to unlock iPhone on iOS 4.3.1 with following basebands.

Support Basebands

iPhone 3GS – 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00

iPhone 4 –  01.59.00

Here is what iPhone Dev Team says,

"We've pushed out the 4.3.1 compatibility fix for ultrasn0w in Cydia — it's now at version 1.2.1.  If you're not already at 4.3.1 and you need the unlock, please be sure you understand how to get to 4.3.1 using a custom IPSW that doesn't update your baseband. There are lots of guides for this (like at iClarified.com).

This isn't a new unlock! It's to allow those who are already unlocked to use FW 4.3.1.  It also fixes the signal bar issue for those who aren't using the unlock but retain an older baseband intentionally.

AFTER INSTALLING ULTRASN0W 1.2.1, PLEASE REBOOT YOUR iPHONEusing the normal "slide to power off" swipe.  T-Mobile users in the USA also should disable 3G mode in Settings->General->Network.

A big thanks to @sbingner and @ronaldsb for helping with the testing of this update!"

Follow below guides on how to unlock iOS 4.3.1. on iPhone 4 & iPhone 3GS

Unlock iPhone 3GS 4.3.1 iOS Baseband 04.26.08, 05.11.07, 05.12.01, 04.13.04, 06.15.00 with Ultrasn0w 1.2.1.

Unlock iPhone 4 4.3.1 iOS Baseband 01.59.00 with Ultrasn0w 1.2.1.

  

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