released the final version of iOS 4.2 to the masses yesterday. Since the latest iOS 4.2 release, the iPhone Dev-Team has released Redsn0w 0.9.6b4 (based on Geohot’s Limera1n exploit) which can jailbreak almost all (with an exception of the iPad) of the current idevices on iOS 4.2.

The updated version of redsn0w 0.9.6b4 packed with the new Cydia and kernel patches for Windows and Mac OS which allows you to jailbreak final version of iOS 4.2.1 running on iPhone, iPod touch and iPad devices.

As of right now, the 4.2.1 jailbreak is *tethered* on all of these recent devices like iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G. Old devices like iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (Non-MC Model) can be jailbroken untethered with this version of Redsn0w. For those who don’t know, a tethered jailbreak means that each time your device loses battery power or needs to be rebooted, you must attach it to a PC or Mac to boot into the jailbroken state.  @comex is working hard on a method that may untether the 4.2.1 jailbreak, but it will require you to have your 4.1 SHSH blobs in order to use it.

If your iPhone is already running Ultrasn0w carrier unlock, STAY AWAY from Redsn0w as it updates your baseband to the latest version, making it impossible (for now) to unlock.

How To Jailbreak iOS 4.2 Final With Redsn0w 0.9.6b4:

Requirements:

• An iPhone 4, 3GS, 3G or iPod Touch 4G, 3G or iPod Touch 2G (Non-MC Model on iOS 4.2.1 GM)
• Download and install iTunes 10.1 on your computer.
• Download iOS 4.1 and iOS 4.2.1 on your desktop
• Download Redsn0w 0.9.6b4 for Mac [Mirror 1] [Mirror 2]
• Download Redsn0w 0.9.6b4 for Windows [Mirror 1] [Mirror 2]

Step 1:

Connect the iPod Touch or iPhone or iPad to your Mac using the USB cable.

Step 2:

Update your device to iOS 4.2.1 firmware using the IPSW file you just downloaded (in the requirement section) via iTunes 10.1.

Step 3:

Run Redsn0w 0.9.6b4 and point it to iOS 4.1 (NOT iOS 4.2.1) to proceed with the jailbreak. Click Next to continue, once the firmware has been verified.

Step 4:

RedSn0w will now prepare the jailbreak data.

Step 5:

You will now have a new screen where you can select packages to install. Select Cydia and other options of your choice. We would not recommend enabling Multitasking on iPhone 3G, as it will slow down the performance.

Step 6:

Now make sure your device is both OFF and PLUGGED IN to the computer before you click Next.

Now you will be presented with a screen where you will have to 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.

Step 7:

Sit back and enjoy while redsn0w will do all the rest for you. Once done, your iPhone, iPad and iPod touch will restart automatically and you will find it jailbroken on the latest iOS 4.2 firmware.

Download RedSn0w 0.9.6b4:

• Download Redsn0w 0.9.6b4 for Mac [Mirror 1] [Mirror 2]
• Download Redsn0w 0.9.6b4 for Windows [Mirror 1] [Mirror 2]

Other Downloads:

• Download iOS 4.2.1 for iPhone 4, 3GS, 3G, iPad, iPod touch
• Download iTunes 10.1 for Windows or Mac

NOTE:

Those of you who rely on a carrier unlock MUST STAY AWAY from Redsn0w and iOS 4.2.1.

As usual, stay tuned for more news and info regarding jailbreaking and unlocking your iDevices by following us on Twitter and/or subscribing to our RSS feed.

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Authors: _GadgetNews

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