Jailbreak iOS 4.2.1 iPhone 4, 3GS, 3G, iPad, iPod Touch

Apple has just released iOS 4.2.1 GM build to developers and luckily enough, iOS 4.2.1 is vulnerable to Redsn0w 0.9.6 b2 released by iPhone dev team. You can go ahead and jailbreak your iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G and iPad on iOS 4.2.1.


  • if you use Ultrasn0w to unlock your phone, should stay away from this update. There’s no unlock available at this time for iOS 4.2.1
  • Golden Master version is targeted for  developers, and buggy.  Not recomended for end users. Still power users can try.


  • Redsn0w 0.9.6b2 (Windows | Mac)
  • iTunes 10.1
  • iDevice with iOS 4.2.1 updated using iTunes.

Jailbreaking iOS 4.2.1

  1. Open RedSn0w 0.9.6b2, click on “select” & browse for iOS 4.1. When the firmware is identified, it will start execution.
  2. DONT select “Install Cydia” and then click Next.
  3. Select the tweaks you wish to have and hit next. Redsn0w will patch and install some files to your iDevice.
  4. Follow the onscreen instructions to put your iDevice in DFU mode when prompted and your device will be properly jailbreak in seconds.

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  • RPLS

    hey guys, i buy an iPad wi-fi + 3g in Portugal yesterday, I did the firmware update to iOS 4.2.1 using iTunes… the problem is that, in the store the seller told me that if i'll try jailbreak my iPad it will die! He said that Apple developed a chip that prevents jailbreaking their iPad's and also that some costumers were there complaining that Jailbreak killed their iPads!

    Well, I want my iPad alive, so I'm asking…

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  • Pingback: Untethered Jailbreak iOS 4.2.1 iPhone 4, iPad, iPod Touch()

  • Jmhindurwa

    is this a thetetherd jailbreak?

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