Redsn0w To Jailbreak iOS 4.2.1 For iPhone, iPad, iPod Touch Released

Jailbreak iOS 4.1 for iPhone 3G - Redsn0w

iPhone Dev Team has released a new version of Redsn0w to jailbreak iOS 4.2.1 for iPhone 4, iPhone 3GS, iPhone 3G, iPod Touch 4G, iPod Touch 3G, iPad and Apple TV 2G.

Redsn0w 0.9.6b4 makes use of Geohot’s USB bootrom exploit used in limera1n for iOS 4.1.

Redsn0w 0.9.6b4 is available for both Mac and Windows users.

As Dev team had explained in the update yesterday there is good news if you are an iPhone 3G, older iPhone 3GS, and non-MC iPod touch 2G user and some bad news for users who own an iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G.

iPhone 3G, older iPhone 3GS, and non-MC iPod touch 2G users will be able to enjoy the benefit of an untethered iOS 4.2.1 jailbreak using Redsn0w.

Unfortunately, iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 2G (MC Model), iPod touch 3G and the iPod touch 4G users will have to manage with a tethered iOS 4.2.1 jailbreak using Redsn0w. As Dev team had explained yesterday:

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.

Comex is working hard to bring a untethered iOS 4.2.1 jailbreak for users with newer devices so we’ll let you know if we have any further updates.

Redsn0w will NOT hactivate or unlock your iPhone. So if you want to unlock your iPhone and currently have iOS 4.1 or lower running on your iPhone then please wait for Dev team to release PwnageTool for iOS 4.2.1 as it preserves the baseband from getting upgraded so that you can use Ultrasn0w to software unlock your iPhone. Dev team is also expected to release a new version of Ultrasn0w shortly for iPhone 3GS and iPhone 3G users. They have mentioned that the unlock for iPhone 4 users will need more effort and are not in a position to provide any further information currently.

Please remember that jailbreaking your iPhone may void its warranty so proceed with caution.

You can download Redsn0w using the download link provided by Dev team at the bottom of their post.

Please don’t forget to let us know how it goes.

[via Dev team’s blog]

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  • varun

    Great job guys..!!!…unfortunately new iphone holders have to problem at all 😉

  • DLock

    whers the unlock… thx anyway

  • Jason

    I have to wait till i get the untethered version, mywi makes me restart on a regular basis.


    why bother releasing tethered jb:s for phones ???
    Anybody really using it ??

    • Daniel @ Soo

      I’m ad using it…..But there is still a lot of prob for the JB IOS 4.2.1 ( tethered )

  • Zang

    I just want untethered for my iPad 😛 I know not BIG issue… but tethered can be a real pain in the damn ass if you travel and only bringing your iPad/iPhone X_X

  • Zang

    Because occasionally, the new updates actually FIX the phones alot… ALA 4.1 for 3G…

    You can say all you want, but only when I crash something or do something stupid to reset device… that is only time I ever get the phone to reboot… It has never been so dead as to need a charge except when navigating all day on TomTom.. naturally expected though..

    So no, tethered isn't a problem for about 99% of people… People just like to complain.. Like you 😛

    • How do u jail break!!!!!

  • simon

    so if i go update my phone to 4.2,will i use redsn0w to jailbreak it,thnkas

  • gee

    I wonder if the new ultrasn0w will work on 4.1 so you can keep your untethered jb but still unlock it.

  • P_NY

    is not working for me, I have an iPhone 4 FW 4.2.1 used Redsn0w and Cydia appears as a white icon and wont open 🙁

  • Pegger

    RedSn0w 0.9.6b4 does not support iPod Touch 2G (MC)

  • Don

    what happened Zang?? you just comment to the favor of tethered jailbreak!! it's not good for you anymore, or you just joined the 1%?


    How do you know if you 3Gs has the "new bootrom"?

  • Jasonjason

    So will my 3GS iOS 4.1 and 5.14.02 be tethered or untethered if I use redsn0w?

  • Kenny

    Cydia will install on my iPad?

  • Austin

    Umm.. If i update and jb with the teatherd jailbreak, can i still get unteatherd if he releases it?

  • gee

    I think it's under Settings – General – About. Look at your model number and see if it starts with MC or something else. Mine is MC so it's the NEW bootrom.

  • Vince

    The new ultrasn0w that will be released will work ony any firmware, Ultrasn0w is not firmware dependant

  • Vince

    Yes, but you would have to restore and jailbreak again… Not a problem, my Ipod Touch was using a tethered JB until I restore and used Jailbreakme 2.0. Go ahead and JB it!!

    FYI an iDevice can always be restore to factory settings after a JB so jailbreaking it will never stop you from restoring, just be sure to save you SHSH blobs after each FW update to be able to use them in the future if you need to roll back.

  • Rick

    I just installed on my Ipad with cydia the problem is most things you install including CYdia updates makes you reboot so you are foreever re jailbreaking… wish I waited for GEOHOT to do something

  • Tlaloc

    Reminder to all, wasn't mentioned in blog: Cydia isn't 4.2 ready yet!!!! You'll have to ssh your deb files onto the phone for them to install. If you don't know why that means then just wait until they have it ready… Otherwise, if you don't have you shsh's saved, your in for a world of hurt!

  • re

    there is a application in cydia tha let's you respring without rebooting

  • lrs


  • S41N7

    Cheka works fine. The new redsnow will install it if you tick the option.

    If you get the White Cidia icon it means you have not tether booted the device follow these steps.

    1) connect and turn off your device
    2) run redsnow follow the instructions up to the the option screen (tick the boot device now or whatever)
    3) follow the sequenced prompts – the trick here is to continue holding the home button until the pineapple appears.
    4) your good to go…

  • Geocool

    So all reviews so far that i've read haven't been fully successful w/ regards to untethered JB??

  • Geocool

    & Guys, can anybody help me out if there's a teeny -tiny chance i could save & restore all my pre-JB installous/cydia apps in case i upgrade to latest 4.2.1? gracias!

  • d brown

    redsnow keeps locking up halfway through for me, any ideas anyone

  • Kinky19

    Jailbreak worka fine, unthetherd on my iPhone 3G! Also
    Cydia works superb!

  • lrs

    pk backup

  • lrs

    what is your B B ?

  • bestman50

    I just bought an iPad 16GB Wi-Fi, My model number starts with MB does that mean I can jailbreak it with out the theathering problem?


  • JP

    Sorry but I'm kinda new to this jailbreaking stuff. When I see people talk about bootrom is that the same thing as the modem firmware? Also I am one of the many that got a little excited about 4.1 and lost my unlock when i jailbroke with limera1n. SO if I have 4.1 with 5.14.02 should I still wait to get 4.2.1 or does it not make a difference? Am I just waiting for the same unlock on 4.2.1 as i am right now with 4.1 on 5.14.02?

  • JP

    Also if I am waiting for the same unlock either way would it be better to just keep 4.1 so that my jailbreak is untethered? Would my jailbreak on 4.2.1 be tethered?

  • simon

    can anyone tell me if i could upgrade my ip4 4.1 to 4.2 and use redsn0w to jailbreak it,thanks

  • lrs

    dont upgrade

  • lrs


  • lrs


  • hi i runned redsn0w on my brothers iphone 3g everything went well except when i went to the home screen to open up cydia it crashed or closed out automatically. need help

  • lrs

    yes it will do not upgrade

  • JP

    K thanks

  • JP

    If my 3GS is an MB am I on the old bootrom or the new?



  • simon

    what should i do,please let me know,thanks

  • Zth

    So let me see if I understood…It has no difference if I have 4.1 with 5.14.02 in my 3GS or if I upgrade to 4.2.1? Am I just waiting for the same unlock on 4.2.1 as I am with 4.1 on 5.14.02? There are two answers but also two questions in both interrogatives!?!?

  • JayRolla

    Works great on my 3g also. Cydia seems to also be at least 50% smoother.

  • Jesus

    I hate apple for this .. They shuld themselves relase the unlock …


    Please everyone make sure you read first, try to understand then ask questions. Don't just post a question without researching. Thanks

  • Prince Of Canada

    is not working for me, I have an iPhone 4 FW 4.2.1 used Redsn0w and Cydia appears as a white icon and wont open 🙁

  • Jacky

    "naturally expected though.."

  • JP

    anyone seen an eta on the new unlock from any sites? just wonderin

  • fas

    I am tired waiting, this is where Android rules

  • ken

    is apple tv tethered?

  • Pdanet ftw..

  • iBanja

    Same to me 🙁

  • Heyy Kinky i m bit confused about baseband..will this redsnow upgrades baseband n helps to unlock my iphone 3g of MB baseband
    with ultrasnow..thanx anyways

  • technogeekchris

    Hi, this requires both IOS4.2.1 and IOS 4.1, but there is no 4.1 for IPAD. Which shall i use then…??? thanks…

  • Depends which version of 3GS you have. Older = untethered, newer = tethered.

  • An unlock is just a few more days away, I know it's tempting to get all hyper as the adrenalin starts running wild but a few deep breathing exercises should calm the anxiety and the long wait will be well worth it, that is until the next major iOS release, then y'all gonna poke the upgrade button in iTunes without considering the consequences and hey presto we'll meet back here again like old times sake asking about an unlock for the latest 5.16.02 baseband.

    BTW, it's rude to SHOUT!

  • Jordan

    Can you boot into a non-jail broken state if you are un-tethered?

  • Lien

    Will my jailbreak be gone if I update to 4.2.1? I am on 4.1 now, jail broke using limera1n.
    and limera1n is a boot room exploit that cannot be patched? What does that mean?

  • Jessie

    Run redsnow as administrator also run it under windows 95 mode under properties. Hopefully this will help you! GL

    • RC

      FUCK!!!! THANK YOU SO MUCH! you are the most awesome guy i know!

  • James

    All right I think I understand all this. Please correct me if I am wrong. My setup: BB 5.14.02, Bootloader 6.4, Model MC137. Therefore:

    I am not interested in the unlock, will stay with AT&T for a while longer.

    I have the new boot rom (MC137) so, I can use this redsn0w to jailbreak, but it will be tethered until something new comes out.

    I can also use redsn0w to upgrade the radio to 6.15.

    Cydia will not work with 4.2.1, correct?

    Thanks for your help and information.

  • bobbuble

    So sad for it ………..
    got error 1611 which i still can’t solve …….
    anyone got solution for the 3G ?

  • Cj

    Redsnow said that it isn’t comparable with mc models. Plz help!!!!!?????

  • kels

    do mine is a 2nd gen mc modle so should this jailbreak work? someonehelp please

  • Spaniard

    Im on version 3.1.2 with the old bootrom. Will updating to version 4.2.1 also update my bootrom version? Which in turn would make the jailbreak tethered?

  • Lou

    Getting a little tired of waiting for an unteathered jailbreak for the ipad. Want airplay damnit! LOL .. not faulting Comex, Devteam, or anyone else for that matter. Though it would be easy with the “promises” of christmas presents.

    But all that aside . thinking about doing this tethered version.

    Has anyone had any issues doing this with the ipad? Any cydia issues?