Greenpois0n For 4.2.1

This video will teach you how to Jailbreak iOS 4.2.1:

Devices it works for:
iPhone 4 (For AT&T AND Verizon Models)
iPhone 3GS
iPod Touch 2nd Gen (MC and Non-MC Models)
iPod Touch 3rd Gen
iPod Touch 4th Gen
Steps:
1. Download Greenpois0n for your OS (Windows and Mac) – http://www.greenpois0n.com
2. Open Greenpois0n + iTunes and set your iDevice into DFU mode by following these instrucations:
a. Hold down the home and power button for a total of 10 seconds
b. Let go of the power button and continue to hold the home button for 20 seconds
3a. Hit “Jailbeak” in Greenpois0n – If your on a Mac
3b. Hit “Prepare to Jailbreak (DFU)” in Greenpois0n then “Jailbreak!” – If your on a Windows
—Troubleshooting Steps—
4. (conditional) If your iDevice just goes to the Apple logo (instantly) or if it just says failed then follow steps 2-3 again!
5. (conditional) If step 4 (conditional) doesn’t work then you MUST restore to 4.2.1
6. (conditional) If you don’t have “Loader” to install Cydia AND IT WORKED ALL OF THE WAY then run Redsn0w over it – here is a tutorial: http://www.youtube.com/watch?v=H-h597PR_KI
**NOTE** You must have the latest version of iTunes!
If you have any other questions be sure to visit: http://www.jailbreakqa.com – the developers also answer questions there

Here is ANOTHER video (this time it’s Greenpois0n running over Redsn0w):

If you have any other questions be sure to visit: http://www.jailbreakqa.com – the developers also answer questions there

Comments 4,466

  1. Nolongercursed

    yo icu you the shit at this, it feels like it took a couple minutes and all of a sudden blam heres cydia thx man. hope ya had a good vacation

  2. Demolutioner

     hi i have an iPhone 4 Green Poison jail broken firmware 4.2.1 and i want to go on the jail broken ios 5.0.1 but with Green Poison again, the thing is how can i do this do i need the iTunes or i can do it directly with a green poison? also if i do that all my custom modifications on my iPhone like changing changing the fonts-slider and stuff like that, will be lost?if yes how can i prevent that? i want to re-jailbreak it but to stay as i have it with all the customizations that i have done.

  3. Demolutioner

     hi i have an iPhone 4 Green Poison jail broken firmware 4.2.1 and i want to go on the jail broken ios 5.0.1 but with Green Poison again, the thing is how can i do this do i need the iTunes or i can do it directly with a green poison? also if i do that all my custom modifications on my iPhone like changing changing the fonts-slider and stuff like that, will be lost?if yes how can i prevent that? i want to re-jailbreak it but to stay as i have it with all the customizations that i have done.

  4. Regtfegtrh

    When I download green posion & it’s done , it shows me the ‘ Open with or Save file with iTunes ‘ & I don’t even know what to do ! .-.

  5. Charleyt@hmail.com

    I used redsnow and my ipod got busted! DONT USE REDSNOW! I HIGHLY DONT RECOMMEND IT! Ive got an ipod 4th gen and i treat it like a baby, really i love the thing! Anyway,redsnow gives you a bug that freezes your ipod on the apple logo and you can’t do anything about it unless you restore it which everyone know is not the way to go. so i had to restore it and lost all my stuff and i cant jailbreak it again. THIS SUCKS!

    1. Felix

      Hi, I have also an Ipod 4th gen and i have jailbroken it too. I hate it very much bud you can plug your ipod in your computer, go to Redsnow, go to Extra’s, then click on Just boot. Then you have to follow the instructions and then is your ipod on! I now it is annoying to do it on this way, bud is is the ONLY way.

    1. iCkrackY

      if it stuck on the code just press power button + home button then it will reboot again it happens to mine as well hehe hope this helps

  6. Justin

    i tried it and it never work its says failed on it it has a tether redsnow on it and then it stays and wont move of the scrolling text screen well it never starts to scroll. and when i try to restore it on itunes it wont restore it gives me an error so imstuck with a tether jailbreak can anyone help me either restore it or get a thetherd version to work

  7. Matt

    Thanks a lot guys, i did it then it went to a conect to iTunes screen. had to restore lost everything. You suck.

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      Author
  8. rajen

    i have i phone 4 verson 4.3.5(8L1)version I want to jailbreak this phone i already download redsnow0.9.8B4 win version and also download firmwire 4.3.4 and 4.3.5 zip file.when i extract both firmwire i did not get the same icon as your’s like ipsw file . when i extract there different types of file so how can i get 4.3.4 firmwire as your ipaw file plz help me

  9. ilyas

    gys i downgrade iphone 4 to 4.3.4 to 4.3.3 its show me error 20 how i solve thjis andsome time shw 3194 also 1013 can i fix with tiny umberlla

  10. ilyas

    gays i have iphone 4 ihave latest 4.3.4 firmware i jailbreak with redsnow 0.9.6rc8b3 when i jailbrek. the cydia icon come blank.when i open again redsnow and select to jailbreak with teathring,when itsdone the cydia icon is work but when i open cydia they ca not update any think just reload it. 2nd problem when i restert my device it will not resterted just stand wat is the soltion

    1. catlover

      1st of all, when you restart, you hve to re-jailbreak it i you want to keep it jailbroken. that means that is is tethered, meaning that everytime that you reboot or restart your iphone, you will have to go back to redsn0w, but just click jailbreak this time and from now on…this will (i think) solve the cydia problem too

  11. Matthew

    WTF MY IPHONE STUFFED UP!!! IT KEEP SAYING FAILED TO GET The AppleS5L8920XARM7M!!! plz help me!!

  12. Matthew

    PLZ HELP ME I DID IT BUT IT SAIDS FAILED TO GET AppleS5L8920XARM7M AFTER 730 SEC THEN AFTER THAT IT JUTS KEEPS DOING THAT!! PLZ HELP ME :'(

  13. Tom *******

    Thanks mate it’s working fine for me on any IPSW and I have no problems with greenpois0n it works superly thanks

  14. Dude

    I’ve tried it twice, everything is ok, until it’s ready to jailbreak, when it writes those fine white letters, it stucks to one part, and it sais on the computer that jailbreak it’s over, but ipod (4.2.1) it’s still stuck on the letters. I’ve to restore it every time.

  15. emonee

    i have tried several times and cant do it on my ipod touch im soooooooooooooo sadddddddddd please help me im desperate. lol

  16. Jessica

    I followed your instructions and found that none of it worked for me. I ended up keeping itunes closed and following the greenpois0n application. This got me as far as the scrolling text and it freezes halfway through. Although its not working for me, thank you for explaining everything clearly, and simply.

  17. DirtyDan

    I followed your instructions completely and Cydia installed without a hitch, but is there any way to delete the apps that I install from Cydia?

    1. catlover

      go to manage in cydia, click on the one that you want to uninstall, then click uninstall in the top right corner

  18. WTF

    Dude I click jailbreak then it just freezes. The bar doesn’t even go one piece of green.

    1. George

      Exactly the same with me I put it into DFU and then i click jailbreak and it just stays the same no white screen or coding or anything!

  19. bluelightning

    Just a nother veido with out ( A )Working download Of THE Program …Thank s Enyway

  20. Austin

    So for some reason when i get to DFU mode the program greenpois0n wont say it is and just keeps saying try again its so confusing ive tried several things as far as doing it a second before the counters to a second after ive tried restoring then trying it nothing seems to be working at all.. any ideas? IT IS 4.2.1 i checked a thousand times it is an ihpone 3g and I did dl the latest version of greenpois0n

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  21. zach

    it wont work iv tried several times and it keeps saying failed to jailbrerak. plz help me i have been trying to do this for a month and it just hasnt worked

  22. Yvonne

    Pls helo. Mine did not work and I’ve tried it many times. I have a 3g iphone ios 4.2.1 (8C148). What now?

  23. Tyler

    Ok i did everything but when i click cydia it directs me back to my lock screen? whats Wrong??

  24. vikks101

    hey im gettin problems with downloading roms to use on the gba/gbc emulator, u guys know the solution for it?

  25. Please Help

    sorry for the trouble but i tried rebooting it and it didnt work, then i tried trying again and it still didnt work. I am ver frusterated

    1. Please Help

      also, it only loads til’ like 50 % then says “extracting”. After that it says i should clear up some space on my hard drive.

    1. iCrackUriDevice

      REBOOT! If that doesn’t work then you might want to consider restoring and trying again!

  26. Vfilmy Online

    Wonderful blog! I found it while surfing around on Yahoo News. Do you have any tips on how to get listed in Yahoo News? I’ve been trying for a while but I never seem to get there! Thank you

    1. iCrackUriDevice

      No I don’t sorry :( I didn’t even know I was in yahoo news (or any search engine for that matter) could you please tell me what you searched or which page you found it on? Thank! You should also check out my YouTube channels (iCrackUriDevice and iCuriPhone) – thanks again and have a great night!

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