Use Redsn0w 0.9.6b2 to Jailbreak iOS 4.2 GM on iPhone 4, 3GS, 3G and iPod touch

Nov 2, 2010

In a previous post we mentioned that the recently released Redsn0w 0.9.6b2 exploit can jailbreak all of the current iOS devices on iOS 4.1. It turns out that it can jailbreak iOS 4.2 based devices as well. MuscleNerd of the iPhone Dev team has confirmed this. Apple has just released the final GM (Gold Master) version of iOS 4.2, so developers can use it. According to iPhone Dev Team's blog:

Today Apple released to developers the GM seed for 4.2.  Tinkerers will find that yesterday’s redsn0w jailbreaks today’s 4.2 GM seed, simply by pointing redsn0w at the 4.1 IPSW (rather than the 4.2 one).  Right now it mostly only makes sense for JB app developers to do that because many apps (including Cydia itself) need to be updated for 4.2.  However, if all you want to do is enable afc2 (to use iFunBox or other file browsers), or to tweak settings like Battery % and Homescreen wallpapers, then go for it (if you have valid paid access to the GM seed).  Be sure to uncheck the Cydia box, though!  Ultrasn0w unlockers should stay very far away from this!!

Download iOS 4.2 GM for iPhone, iPad, iPod touch and SDK.

All supported devices are:

  • iPhone 4
  • iPhone 3GS
  • iPhone 3G
  • iPad
  • iPod touch 4G / 3G / 2G

The procedure is as follows:

Step 1: Download iOS 4.2 & iOS 4.1 (required for Redsn0w 0.9.6b2) for your version of iOS device.

Step 2: Update to iOS 4.2 firmware using the IPSW file you just downloaded via iTunes 10.1 Beta 2.

Step 3: Start Redsn0w 0.9.6b2 and point it to iOS 4.1 (Final Version, NOT iOS 4.2) to proceed with the jailbreak.

Step 4: Now select “Install Cydia” and click “Next”. Optionally (if available), you can also select any other option you like.

Step 5: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.

At this stage you will be presented with a screen where you will have to quickly hold the “Power” button and while doing that, you will now have to hold “Home” button too. After a few seconds release the  “Power” button but keep holding the “Home” button until installation begins.

Step 6: Sit back and enjoy while Redsn0w does the rest. Once done, your iPhone, iPad and iPod touch will restart automatically, and you will find it jailbroken on the latest iOS 4.2 firmware.

Note: The original author over at Redmondpie tried to jailbreak an iPad on 4.2 by pointing Redsn0w to iOS 3.2.2 , but it didn’t work. So except for the iPad, the Redsn0w jailbreak on iOS 4.2 is working fine on all iOS 4.2 Devices. For now.


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