Update iPhone 3GS / 3G Baseband to 06.15.00 with Redsn0w 0.9.6b5 [iOS 4.2.1]

Pwnage iOS 4.2.1

The iPhone dev team released Redsn0w 0.9.6b5 for Mac and Windows for updating iPhone 3G and iPhone 3GS baseband from 05.14.02 / 05.15.04 to 06.15.00. For this it uses baseband from iPad iOS 3.2.2 firmware which is 06.15.00 and works well. But there are certain drawbacks and if you don’t want to invite trouble read the warnings from dev team.

  1. There is no way to come back down from 06.15, and there’s no hiding the baseband version from Apple.  You’ll be voiding your warranty in a very obvious way.
  2. If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).
  3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail).  You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).

Steps to update iPhone 3GS/ 3G to 06.15.00 baseband and jailbreak it on iOS 4.1 /4.2.1 :

1) Download iOS 4.2.1 for iPhone 3GS or 3G and Redsn0w 0.9.6b5 for Windows.

2) If you don’t have iOS 4.2.1 running then restore to iOS 4.2.1 firmware via iTunes 10.1.

3) Start Redsn0w 0.9.6b5 and point it to iOS 4.2.1 firmware to proceed with the jailbreak.

Also Read: Need for Speed Hot Pursuit for PC, Xbox 360, PS3 and Wii is Available Now

Redsn0w Windows

4) Now select “Install Cydia” & “Install iPad baseband” options and then click “Next” to continue. Redsn0w will now fetch the exploitable 06.15.00 baseband from 3.2.2 firmware and will replace it the baseband in iOS 4.2.1 / 4.1.

iPhone 06.15 4.2.1 update

5) As you see in the window make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

Now quickly hold “Power” button and then while holding the “Power” button, you will now have to hold “Home” button too. Now after few seconds release “Power” button but keep holding “Home” button until installation begins.

Also Read: Enable Multi-Touch and Pinch Zoom on Windows Laptop Trackpad

Redsn0w Windows Power

6) Wait for the process to complete. After thatiPhone or iPod touch will restart automatically and you will find it jailbroken on the latest iOS 4.2.1 firmware, with the unlockable 06.15.00 baseband.

Inorder to unlock iPhone 3G/ 3GS follow the post here. It uses latest Ultrasn0w 1.2 to unlock using updated o6.15.00 baseband

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