How to jailbreak 4.2.1 (tethered)

Discussion in 'iPhone Jailbreaking' started by DannyBoy, Nov 23, 2010.

  1. DannyBoy
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    DannyBoy New Member

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    [​IMG]

    The iPhone Dev Team has just released Redsn0w 0.9.6b4 today which brings first proper jailbreak, with working Cydia and MobileSubstrate for all iOS 4.2.1 devices.

    For those of you who don’t know, Redsn0w 0.9.6b4 is based on Geohot’s Limera1n bootrom exploit which has already pwned all current iOS devices for life. The only problem is that it is a tethered jailbreak, which means you will have to boot it into a “jailbroken state” on every reboot. This so called tethered or semi-tethered jailbreak condition in Redsn0w 0.9.6b4 however only applies to the new 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 right now using this latest version of Redsn0w. So until and unless Comex of Spirit and JailbreakMe fame comes up with another untethered hack for iOS 4.2.1, the jailbreak we get for the newer devices will be tethered (or semi-tethered).

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

    Follow the step by step instructions posted below to jailbreak iOS 4.2.1 with Redsn0w 0.9.6b4:

    Step 1: Download iOS 4.2.1 for your version of iOS device.

    Step 2: Update/Restore to iOS 4.2.1 firmware using the IPSW file you just downloaded via iTunes 10.1.

    Step 3: Start Redsn0w 0.9.6b4 and point it to iOS 4.2.1 firmware 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 “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 6: Sit back and enjoy while redsn0w will do all the rest for you. Once done, your iPhone or iPod touch will restart automatically and you will find it jailbroken on the latest iOS 4.2.1 firmware.

    For iPhone 4, 3GS (New Bootrom), iPod touch 4G / 3G / 2G, iPad ONLY:

    Step 7: Now from here onwards, whenever you want to do anything related to jailbreak like SSHing into your device, or running Cydia, you must first run your device in the so called “jailbroken state” on every reboot by using “Just boot tethered right now” option in Redsn0w.

    Redsnow-Windows-Link

    Redsnow-Mac-Link
    Last edited: Nov 24, 2010
  2. JTSVMktg
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    JTSVMktg New Member

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    Is it really worth it to update? If I just got my phone running smooth while being JB'kd and as a power user am I gaining anything by being updated other than the apps I've tried to to install today that are for 4.2 update?

    My first thought is too wait however my curiosity says update.

    What is your opinion also am I correct in recalling that you don't JB?
  3. Unleashed
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    Unleashed Administrator Staff Member

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    excellent news, and tethered is ok because how often do you restart the iphone any way?
  4. Bobik
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    Bobik New Member

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    who cares about the jailbreak anyway. WE need UNLOCKY
  5. DannyBoy
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    DannyBoy New Member

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    Mine isn't at the moment. I'm going to wait and see what other tools come out before I jump. Lately, I have just jailbroken for MiWi. But if you just got an iPhone and want a jailbreak this is the way to go for now.
  6. Unleashed
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    Unleashed Administrator Staff Member

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    who cares about unlock we dont need unlock we have sim free iphones or are happy with the carrier its locked to ;)

    but with out jailbreak you have no unlock any way so the jb is just as important for you to have.
  7. Bobik
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    Bobik New Member

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    True, but I bet $1, that there are more people who need UNLOCKY more then who need jailbreak.
  8. Unleashed
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    Unleashed Administrator Staff Member

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    your probably right, the amount of countries still have iphones locked to a single carrier...

    though i updated about a week ago i was using the 4.2 gm and then the 4.2.1 so i dont need jailbreak and am happy to go with out it.

    + with out jailbreak how will you unlock? remind me where is it you find your unlock tool? lol
  9. Unleashed
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    Unleashed Administrator Staff Member

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  10. skweekymagee
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    skweekymagee New Member

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    I personally think tethered Sucks. You never know when you might download something from Cydia where the phone needs to be rebooted. If that happened then you could be stuck.

    I'm interested in the process that's in the works how to make it untethered using your saved 4.1 shsh blobs but not so I can update to 4.2.1 but maybe for something futher out. Right now 4.2 offers absolutely nothing for me.
  11. Unleashed
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    Unleashed Administrator Staff Member

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    personally ill update even if the firmware has nothing to offer like the other one that was only to stop jailbreakme.com

    but 4.2.1 has mobileME's find my iphone for free, to me thats reason enough to upgrade new sms tones and printing that ill never use but its nice to have there just in case..

    i agree with you though un tethered would be better
  12. iGaz
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    iGaz New Member Staff Member

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    So what happens when you have to reboot? I know you will have to plug it in to your computer and then jailbreak again but, are you left with a restored phone and have to start again or are you right back where you left off...?
  13. N4N113
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    N4N113 New Member

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    so is a un tethered version coming?
  14. Unleashed
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    Unleashed Administrator Staff Member

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    the first few files from cydia i know i reboot 100 times, so that would b annoying
  15. umarrehman187
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    umarrehman187 New Member

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    how do i get the ipsw 4.2.1 file?

    my ipad is already updated to 4.2 firmware?
  16. umarrehman187
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    umarrehman187 New Member

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    sorry so i went of this felix burns site downloaded the 4.2.1 ipsw file for ipad which i updated through itunes when it promepted me, so now what im doing i went on itunes clicked shift and chose the ipsw file that i just downloaded from felix burns then i will restore with that? is that right then i will carry on to start redsnow?
  17. Unleashed
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    Unleashed Administrator Staff Member

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    either select download only in itunes and open it in the folder or use the direct link..


  18. sakumaxp
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    sakumaxp New Member

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    everytime i click on cydia, it wont open..
  19. Overtime
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    Overtime New Member

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    Im also JB on 4.1 I think its always good to have the last software on my phone, i think the iphone is a beast and it deserves to be running up to date and efficent but theres no reason to jump the gun and install 4.2.1 unless your having issues with your phone. If not then just be patient there will be a unteathered JB. As for the new 4.2.1 software the new printing feature is pretty sick as i use my iphone as a lil hand held computer!!!
  20. sakumaxp
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    sakumaxp New Member

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    doh, this is what i get for not readng directions, i feel so dumb...ok i tried re doing all the stuff with this new jailbreak its so annoying, im going back to 4.1 till an untethered one comes out
    Last edited: Nov 23, 2010

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