How to Jailbreak recent iOS 4.2.1 with latest Redsn0w 0.9.6b4 [Step-by-Step Guide]

November 23rd, 2010 Talha

You can now jailbreak recent iOS 4.2.1 with latest version of Redsn0w 0.9.6b4 currently released by the iPhone Dev Team. It is really the only suitable jailbreak comfortable with Cydia functionality and MobileSustrate for all iPhone, iPad and iPod touch devices running iOS 4.2.1. We find it beneficial to introduce Redsn0w for our readers who have just entered in the dynamic world of Apple’s products and are a little bit shy to jailbreak their iOS devices. Basically, Redsn0w 0.9.6b4 makes use of our favorite MAJT ( Master of all jaibreaking Tools-our created name) Limera1n  bootroom exploit which is efficient to jailbreak  all present iOS devices once and forever.

But you have to boot Limera1n in a Jailbreak status for every reboot process i.e it is a tethered jailbreak. This status only occurs when you use Redsn0w 0.9.64b with newish models of iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G. The previous oldie models as iPhone 3GS (old bootrom), iPhone 3G and iPod touch 2G (Non-MC Model) don’t face this situation i.e latest version of  Redsn0w 0.9.64b  is an untethered jailbreak for these devices .

CAUTION! If you rely on CARRIER UNLOCK, NEVER TRY Redsn0w & iOS 4.2.1 on your device.

Here is a complete step-by-step guide to jailbreak recent iOS 4.2.1 with latest Redsn0w 0.9.6b4 accordingly and perfectly.

Step 1: Download recently released iOS 4.2.1 for your device(download links given below).

Step 2: Now Update/Restore to iOS 4.2.1 microcode using the ipsw.file, you just downloaded through iTunes 10.1.

Step 3: Then start Redsn0w 0.9.6b4 and point it to iOS 4.2.1 firmware to do jailbreak process.

redsn0w 0.9.6b4

Step 4: Select “Install Cydia” and click “Next”.

redsn0w 0.9.6b4redsn0w 0.9.6b4

Step 5: Now make sure your device is certainly OFF & PLUGGED IN to your PC, then click “Next”.

Then efficiently hold “Power” button & then hold “Home” button at the same time. Now after few seconds release “Power” button but don’t release “Home” button until installation starts.

redsn0w 0.9.6b4

Step 6: You have almost done your work; the rest part will be done by Redsn0w. Your device will restart automatically indicating that all is over and fine. You have jailbroken your device on the recent iOS 4.2.1 microcode.

Download Redsn0w 0.9.6b4

Direct Download Links for iOS 4.2.1;

Download iTunes 10.1 for Windows and Mac.

Stay tuned with your jailbroken iPhone, iPod touch and Hitechanalogy to get more about jailbreak techniques.

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