Jailbreak iOS 5.1 iPhone, iPad, iPod touch (A4 Devices) Using Redsn0w 0.9.10b6

by Ahmed Omar on March 8, 2012

It was only yesterday when Apple released iOS 5.1 for all devices including the newly released “New” iPad announced in yesterday’s event. iOS 5.1 brings some new features and minor bug fixes to all iPhone, iPad and iPod touch users.

The iPhone Dev Team and BigBoss have warned jailbreakers from upgrading to iOS 5.1 because you’ll lose the untethered jailbreak made on iOS 5.0.1. However, some users updated to iOS 5.1. That’s why the iPhone Dev Team pushed a new Redsn0w update in order to allow tethered jailbreak for A4 devices using Redsn0w 0.9.10b6. Moreover, the BigBoss updated “SemiTether” jailbreak tweak to work on iOS 5.1.

Important Notes

  • This jailbreak is tethered jailbreak which means you’ll need to connect your device to computer everytime it reboots. You’ll need to do a tethered boot.
  • If you rely on unlock, don’t follow this guide. We’ll post a guide shortly on how to preserve baseband and keep the unlock.
  • The jailbreak is not meant for A5 devices, i.e. iPad 2, iPad 3 and iPhone 4S.

Jailbreak iOS 5.1 Using Redsn0w 0.9.10b6

STEP 1: Download iTunes 10.6 from here, iOS 5.1 from here and Redsn0w 0.9.10b6 [/].

STEP 2: Now open iTunes, back up your device and restore using the downloaded iOS 5.1.

STEP 3: Open Redsn0w, select “Jailbreak”  then “Install Cydia” and follow on-screen instructions to put your device into DFU mode.

STEP 4: Finally do a tethered boot, launch Redsn0w, select “Extras” then”Just Boot” and put your device in DFU mode to get it rebooted and working.

STEP 5: This step is optional. Now, you can get “SemiTether” tweak from Cydia, you can read everything about Semi Untethered jailbreak here. You can get the tweak for free from BigBoss repo: http://thebigboss.org/semitether.


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  • http://www.facebook.com/Jhonatan.Navarro.G Jotape Navarro G

    whats means Semi Untethered jailbreak? :)

  • iPhoner

    it means u have to re-connect the device to the PC and use a software after each reboot.

  • Kevinrichter

    u can reboot but some features are disabled intul you reboot using pc

  • http://www.facebook.com/Jhonatan.Navarro.G Jotape Navarro G

    thanks ;)

  • Rufuslufus

    You do not need to plug your device to your PC to reboot, but some apps won’t work with semitethered jailbreak. To get these apps working again, you need to do a tethered boot. That’s why it is called semitethered. It’s almost untethered but with some weird bugs…

  • gustavo

    hello i have install ios 5.1 on my iphone 4 and i have itunes 10.6 and lates redsnow to tethered jailbreak my iphone but when i try to do it it says certain operations like de a5 jailbreak are disabled due to incomplete libriries it says that i should install lates itunes and i have it pleaaase help also when i hit jailbreak it doesnt show me the window where i chek install cydia it goes straight to getting into DFU and i follow the steps and nothing happens it says that my iphone isnt in DFU and it actually is cuz itunes pops up and tells me so… PLEASEEE HELP

  • gustavo

    redsnow says couldnt load mobiledevice.dll

  • D7my

    The ibooks isn’t working after jailbreaking
    Is there any way to fix it?

  • Esteve Mirella

    I am having the same problem as @gustavo
    is there any solution to this? HELP PLEASE

  • Bob

    Ugh it won’t work

  • Rodrigo_a_

    not works, can´t open cydia

  • Yepp

    And the infamous apple cycle starts over, tethered, semi, 4 months later and an untethered

  • DIMInuta

    did you find the answer? i have ios 5.1 on my ipod touch 4g and the latest itunes =( and i have the same problem

  • Christopher Maille

    si je l’installe sa ve dire ke l’iphone ne redemarre pas manuellement on est obliger de le brancher a l’ordi et faire un justboot ?? de l’aide comprend pas ?

  • http://twitter.com/robbiehirzian Bie Partical ☮


  • http://twitter.com/robbiehirzian Bie Partical ☮


  • Wf

    People r to impaitient. These guys that do these jailbreaks for us r nice enough for giving us this great software. Just b paitient. They will come through again. 5.0.1 untethered jailbreak is still great. Why upgrade to 5.1 until u can do it with an untethered jailbreak. Apple is sucking all of u into thinking u need these updates. In reality most of the things apple offers on an iOS update is usually available on cydia.

  • Brett

    IS it untethered for 3gs old bootroom?

  • Chriswilky95

    I am having the same problem as @gustavo

    have tried everything please HELP

  • Pancakedc

    WF is so right relax everyone

  • Dupuismarc42

    absolutly very well said wf !!!!!

  • Cobaltthegreat

    Chill guys… The only thing 5.1 is going to bring to the table that will really make any difference is, allegedly, improved battery life and an extra 30 megabytes of 3g download on the app store. If you own an A5 device a 4g icon. *roll eyes* No firmware update will ever be worth as much as an untethered JB, especially in these days of multi-processors and bootroms.

  • Ibrahim Khalil

    I’m having the same problem as @gustavo and @Chriswilky95

    “redsn0w says ‘couldn’t load mobiledevice.dll’.”

    iPod Touch 4G

    Would it have something to do with iOS 10.6?

    Also, when I open the app it doesn’t say “this is the latest version of redsno0w”

    can you pls tell me what to do ASAP. I’ve been out of the Jbing loop for a while now. i updated from 4.2 thinking this would work fine. :S
    now i’m not jailbroken for the first time in ages!

    All Help is greatly appreciated
    Thx in Advance!

  • Soomy93

    When will the untethered jailbreak be released?? Hopefully soon!!

  • Scholar

    I just bought an iPhone 4s 5.0.1, can i still jailbreak it with Absinthe (i mean still 5.0.1)?

  • Wf

    Yes. Just stay on 5.0.1 and u will b fine

  • Csaurabh30

    I just synced my iphone4 5.0.1 i am unable to make and receive calls now. How do i fix this as i am jailbroken and restoring to 5.1 will remove it. When i make the calls ppl receive it but i cant hear anything

  • Gallacc

    Exactement :)

  • http://twitter.com/REINARUBIN JADE

    Redsn0w won’t recognise my iPhone 3GS in DFU mode. Help?

  • xHussain

    Read the important notes above, it says that this jailbreak is not meant for a5 devices (iPhone 4s, iPad2 & iPad 3).
    Its only for a4 devices like the iPhone 4

  • xHussain

    True, and if u want to download any app in the appstore thats 20mb or more, download (3g restrictor 5) tweak from cydia.

  • mistic

    I have the same problem too..

  • Howpiano77

    if i am jailbroken under 5.0.1 and then jailbreak to 5.1.. will lose all of my previous tweaks, apps, etc.?

  • Mm

    Safari does not work… Even in tethered boot

  • guest

    try on another computer

  • Kvscott241

    did all the steps then when i reboot the phone cydia will not reopen?

  • Openwww

    Great works for me – for my iPhone4 !

  • Maverick

    My Redsn0w keeps on crashing every time I try to jailbreak my iPod Touch 4g running ios 5.1. Can someone please help me out

  • Zia Shahid Choudhery

    My itunes stuck on first step of sync ” waiting or sync to start ” as i unplugg the iphone it’s start working help me out guys

  • Zia Shahid Choudhery

    my crack apps And cydia won’t open and then i have rejailbreak it to work then crashes again after fews days this is keep happening what should i do

  • Jackdouglas2011

    works for me on my ipod 4g! weeeeeeeeeeeeeeeeeeeeeeee!!!!!!!!!!!!!!!!!!

  • Zia Shahid Choudhery

    any help please

  • http://www.facebook.com/jlucini Jasmine Lucini

    cant wait till its untethered the 5.1

  • Mangweit

    can i ask something ?
    iphone 4 haven unlock 4.11.05 ios 5.0.1 does it work ?
    Or i need to update to ios 5.1?
    or haven out yet >

  • staalborstel

    One small question: if there would be coming an untethered JB later, and I’m still having the tethered, would I have to restore and then use the untethered?

  • Staalborstel

    I jailbroken but it’s stuck on “exploiting with limera1n” in redsn0w :S what now?

  • http://www.facebook.com/Zikness Zik Ness

    if im not mistaken. you just rejailbreak it, and untick install cydia

  • Lieuccao

    i am stuck on the exploiting with limera1n screen.

  • Andres Galindo31

    in what date may download the unthetered ?? : (

  • Andres Galindo31

    neither do I

  • Andres Galindo31

    all applications are deleted but your music and images can be saved allowing backup

  • Guest

    unable to install apps after jailbreak ??? what to do ?

  • HalcyonDays

    Restart your computer in safe mode and run the program again would solve this problem.

    btw, if you try to “just boot” in safe mode , and you face this problem again, just restart your computer in normal mode(means you don’t have to enter safe mode), and run “just boot’. It will work.

    Hope this can help you. It worked for me.

  • Unknown

    added the source, but the file semitether could not be found in the source or even if i search it. how can i solve this?

  • Michgaye27

    when can i download the untethered version for ipod touch 4?

  • Brock

    i got my phone jailbroke, but my cydia app is white and when i open it, it closes right away. any help??

  • Kash

    Open resnow> into dfu mode > extras>just boot ,,,,,,,off you go

  • http://www.facebook.com/people/Lee-Brgzx/1615472706 Lee Brgzx

    keep trying it will eventuly work

  • http://www.facebook.com/people/Lee-Brgzx/1615472706 Lee Brgzx

    does the siriport certificate actuly work plz help i want siri on iphone 4

  • http://www.facebook.com/people/Lee-Brgzx/1615472706 Lee Brgzx

    any 1 got untethered for 5.1 iphone 4

  • http://twitter.com/Jparale80h8 iΔdφRe80h8§†Δ†e

    Does SemiTether fix the cydia crashes and safari after rebooting?????

  • starwars

    Hey I am an iPod touch iOS user, and am having problems getting gems from kingdom age game on the iPod. Does get it, but then bails out last second.