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Jailbreak iOS 4.3.4 on Windows & Mac Using Redsn0w 0.9.8b3 [How-to Guide]

In order to patch the serious PDF exploit security hole in iOS 4.3.3, just last week, Apple rolled out its next update for iOS 4, which is iOS 4.3.4. This particular firmware update also renders the highly popular and the easiest jailbreak tool, JailbreakMe 3.0 to be useless. For whatever reason, if somehow you've upgraded your device to firmware 4.3.4, then you are in luck because the iPhone Dev Team just made a small update to Redsn0w so that it would be compatible to jailbreak iOS 4.3.4. Note that this is a tethered jailbreak and is compatible with most iDevices except for the iPad 2.

iOS 4.3.4 IPSW
Note: If you have a device that's carrier unlocked, then this tutorial is NOT for you because Redsn0w will revert it. It's recommended that you use PwnageTool instead which we will be providing a tutorial for you later.

Steps on How to Jailbreak iOS 4.3.4 Using Redsn0w (Tethered):

  1. First you will need download the iOS 4.3.4 IPSW file.
  2. Open iTunes and restore your device or update to iOS 4.3.4. When clicking on Restore, be sure that you are holding down the SHIFT (Windows) or ALT (Mac) key so you can browse for the 4.3.4 IPSW.
  3. Download the latest version of Redsn0w for Mac or Windows, and browse for the iOS 4.3.4 firmware. Redsn0w will then identify the firmware and it will inform you once it successfully done so.
  4. Click on Next and this should take to a window where you can select various options of which jailbreak components would you like to install. Since this tutorial is for jailbreaking, for now let's just check the "Install Cydia" option. Although you can check other items as well only if you are aware of what they can do. Once you have checked all desired options, just click on Next.
  5. You will be brought to another window which the program will ask you to ensure that your device is both plugged in and turned off. Only click Next if your device is off and plugged into your computer. If you are ready, then click Next.
  6. The next window is where the program will instruct you to have your device enter DFU mode. Just follow that on-screen instructions or do this:
    • Hold Power + Home buttons for 10 seconds.
    • Release the Power button while still holding the Home button for 15 more seconds.
    • If done correctly, your device should enter DFU Mode.
  7. If you have succeeded in placing your device in DFU Mode, then Redsn0w should be able to detect it. If it does, then your work here is done because at this point the program should take care of the rest. So just sit back and wait but just don't unplug your device or launch iTunes. You are going to receive a screen prompt that the process is complete.

And you are done! We would like to reiterate that this is a tethered jailbreak which means that you will lose your jailbreak each time your device is turned off or will be needing a reboot. In order to reinstate your device's jailbroken state, you will need to plug it to your computer, open Redsn0w and choose "Just boot tethered right now."

Download Links:

Download iOS 4.3.4 IPSW for iPhone 4, 3GS, iPad and iPad touch
Download Redsn0w 0.9.8b3 (Windows)
Download Redsn0w 0.9.8b3 (Mac)

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    deepika jain10 years, 1 month ago

    hi …
    i have an iphone 3gs factory unlocked, iOS 4.3.4 and BB 05.16.02,
    I want to have cydia on my phone as i am missing my andriod lock function, can u please help me with the jailbreak plus, how to get the android lock back on my phone!!!!!
    also is iOS 5 already released officially, cani get it too on my 3gs??

      Pramod10 years, 1 month ago

      iOS 4.3.4 is currently only a tethered JB. So, each time you reboot/your iPhone powers OFF’s, you will need your PC to boot it up back again via Redsn0w. If that’s perfectly fine with you, you can use Redsn0w0.9.8b5 ( for your jailbreak. Read this.

    lateef10 years, 2 months ago

    hi.. i have i phone 4g 16gb. my bro was send from us.but my lockel sim its not working…do u have any jailbreak … ofter using jailbreak it will work…

      Pramod10 years, 2 months ago

      Your iPhone 4 can only be unlocked using a Gevey SIM interposer. Currently, there is no s/w unlock available for the iP4 if your iOS is greater than 4.0.2.

    shannon hobbs10 years, 2 months ago

    im trying to jail break my iphone 3g and its update to 4.3.4 but nothing im downloading is saving to my desktop… this is pissing me off so much… i ahve been trying to do this for like 4 hrs and nothing im doing is right… i some how did a master reset and lost everything… can you please explain what im doing wrong and also im using a window vista comp if that makes any differents

      Pramod10 years, 2 months ago

      First of all, your having an iP3GS and not a 3G. Secondly, what are you trying to download in the first place to your desktop? This seems to be more of a PC issue than an iPhone one.

    Alexander Best10 years, 2 months ago

    sir pramod..thx for your replies i try the procedure and its work…thank you so much..

    for joel use tinyUmbrella latest versions, its have cydia that saved 4.3.3 shsh..
    correct me if im wrong..

    Joel10 years, 2 months ago

    How will I know if cydia has saved my SHSH.blob for iOS 4.3.3 thanks and if not? what will happen? thanks

      Pramod10 years, 2 months ago

      Use TinyUmbrella to find out which versions of the iOS Cydia has in store for you. Make sure that you enable the Request SHSH from Cydia option from its Advanced menu. And if you don’t have any, your stuck with the only option to update to iOS 4.3.4 with a tethered jailbreak.

    Joel10 years, 2 months ago

    Hello Pramod,

    my iphone 3gs 4.3.3 is already jailbroken with JB 3.0, but it suddenly stuck on an apple logo when I open the cydia.. i put it now on the recovery mode. Please advise how can I restore my 4.3.3 without upgrading to 4.3.4…

    sorry but just a newbie


    Alexander Best10 years, 2 months ago

    i try your step above, i succed install 4.3.4 firmware.
    next is jailbreaking with redsnow, everything seem normal until the process finish, the cydia also installed on my iphone 3Gs but the icon is only white (no cydia icon as usually).
    when i try to open it, it doesnt open just blink on my screen…
    i try to re-install from first step for about 3 time but the result is still the same..
    i try to downgrade to 4.3.1 but the itunes say error 20…

    could you help me sir?? i run out idea…

    my iphone detail :
    type : 3Gs
    model : MC133ZP
    modem firmware : 05.16.02

      Pramod10 years, 2 months ago

      You must know that an iOS 4.3.4 jailbreak is a tethered jailbreak. So, you need to switch OFF your iPhone and rerun Redsn0w this time with the Just Boot tethered now option ticked. That’s should bring your Cydia back to life & make sure you repeat the same procedure each time you have rebooted your device.

    Justin Htoo10 years, 2 months ago

    is this process reversible? i m not sure if my iphone is carrier unlocked or not because this is not my phone and my bro send it to me from sg. i can use local sim here. btw, i don’t live in sg and i m out of sg but i m still able to use local sim cards. but i m not sure if it is iphone carrier unlocked or just normal. so i want to know how to check it? and if i jailbreak, is it reversible?? that means in case my phone is carrier unlock and this process with redsnow has reversed it…is it reversible back to its unlock settings. Please ans me for these questions. thankyou. :D

      Pramod10 years, 2 months ago

      Usually the iPhones brought in from Singapore are factory unlocked. So if in case a local SIM is indeed working on your iPhone w/o a JB, its definitely a factory unlocked version. Yes, a jailbreak is always reversible. You can do this by restoring your iPhone to Apple’s stock IPSW via iTunes.