How to Jailbreak iOS 4.2.1 with RedSn0w 0.9.6b4

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Comments: 101

Dev-Team has release RedSn0w 0.9.6b4 to jailbreak iOS 4.2.1 on iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad. RedSn0w 0.9.6b4 jailbreaks iOS 4.2.1 with working Cydia and MobileSubstrate. Step-by-step instructions on how to jailbreak iOS 4.2 with RedSn0w 0.9.6b4 after the jump…
RedSn0w 0.9.6b4 is capable of jailbreaking all iDevices on iOS 4.2.1 however, newer devices are tethered jailbreak only. 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.

Untethered Jailbreak: iPhone 3GS (old bootrom), iPhone 3G, iPod touch 2G (Non-MC)
Tethered Jailbreak: iPhone 4, iPhone 3GS (new bootrom), iPad, iPod touch 4G, iPod touch 3G, iPod touch 2G (MC Model)

WARNING: unlockers please stay far far away from this official firmware (and all official firmware). Wait for the ability to create custom 4.2.1. IPSWs that don’t update your baseband! If you’re not an unlocker, read on!

Lets jailbreak iOS 4.2.1 firmware on iPhone 4, 3GS, 3G, iPod Touch 4G, 3G, 2G and iPad with RedSn0w 0.9.6b4.

How to Jailbreak iOS 4.2.1 with RedSn0w 0.9.6b4

Step 1

Step 2

Connect your iDevice to the iTunes 10.1 and restore iOS 4.2.1.
ATTENTION iPhone Users: iOS 4.2.1 will update your baseband which is not unlockable ATM.

Step 3

Once your iPhone / iPod Touch / iPad is running iOS 4.2.1, execute the downloaded RedSn0w 0.9.6b4.

jailbreak ios 4.2.1 redsn0w 0.9.6b4

Step 4

Hit the Browse button and select the downloaded iOS 4.2.1 firmware. RedSn0w will recognize the firmware, now hit the Next button.

jailbreak ios 4.2.1 redsn0w 0.9.6b4

Step 5

Now select your desired options. Make sure that atleast Install Cydia is selected. Now hit Next button.

jailbreak ios 4.2.1 redsn0w 0.9.6b4

Step 6

RedSn0w will ask you to turn off your device. When it’s off and plugged in, hit the next button.

jailbreak ios 4.2.1 redsn0w 0.9.6b4

Step 7

Now you’ll be instructed to put your device into DFU Mode. Follow the on screen instructions.

jailbreak ios 4.2.1 redsn0w 0.9.6b4

Once your device goes into DFU mode, RedSn0w will start jailbreaking it. Once done, you can find the Cydia icon on your iPhone / iPod Touch / iPad home screen.

That’s it. You’ve successfully jailbreak iOS 4.2.1 on iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad with RedSn0w 0.9.6b4.

How to Boot Tethered jailbroken Device after reboot:

jailbreak ios 4.2.1 redsn0w 0.9.6b4

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Posted in: iPad, iPhone, iPhone Guides, Tutorials, Jailbreak iPad, Jailbreak iPhone, RedSn0w on November 23, 2010

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Comments:

  1. amateuriphoneuser 30 July 2011 at 3:55 pm #

    anybody can help me? after all the step completed, the time my iphone 3g reboot, the apple icon show up not pineapple icon show up…. then the iphone jus cannot boot up and hang in boot up apple icon…..

    Reply
  2. Guntaey 16 August 2011 at 9:22 pm #

    Matur suwun gan 3Gku wes isoh dijailbrake.. uapik tenan tutoriale..

    Reply
  3. jbchong1258 1 October 2011 at 6:03 pm #

    pls help me my iPod did not jailbreak……and it hanged

    Reply
  4. bekah143 20 November 2011 at 4:05 am #

    it won’t finish completing the jailbreak. its been frozen for hours. i’ve tried it two times. Now it won
    t turn on. What should I do? I need help!

    Reply
    • mike10422 14 August 2012 at 6:13 am #

      plug it in to the computer using iTunes an restore your device. That’s what happened to me at first so i restored it.

      Reply
  5. Overdone 3 April 2012 at 2:25 am #

    my firmware will not show up in any files when I load up redsn0w, I have already downloaded it and saved it to computer.

    Reply
  6. swagxxman 9 June 2012 at 1:50 am #

    thank you very much developers you are the first to help me thanks

    Reply
  7. mike10422 14 August 2012 at 6:12 am #

    Thank you very much. It worked just fine for me

    Reply
  8. sharippe 24 September 2012 at 6:10 am #

    its stuck at uploading ramdisk

    Reply
  9. JImmys81190 4 December 2012 at 6:25 am #

    Cydia is asking me to update, how do I go about doing this? Any links you could direct me to?

    Reply
  10. FuutonNaation 3 January 2013 at 1:01 am #

    in the redsnow application, after i try to enter DFU mode it just says “Exploiting with limera1n” and just stays there, what do i do?

    Reply
  11. Turza 22 February 2013 at 9:56 pm #

    after doing all of this icant fina a cydia icon on my i phone 3g….

    Reply

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