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Jailbreak iOS 4.3.5 on Windows & Mac Using Redsn0w 0.9.8b4 [How-to Guide]

With only about 10 days or so after Apple has released iOS 4.3.4, the Cupertino company just released another incremental update to the iOS 4, which is the iOS 4.3.5. As you all can probably recall, iOS 4.3.4 firmware update is no more than a security patch which is used to plug a security hole that's present within Mobile Safari, the same hole that the popular jailbreak tool, JailbreakMe 3.0 has used. Now iOS 4.3.5 is yet another security firmware update that's aimed to patch a security problem with certificate verification.

Redsn0w for Windows and Mac
Needless to say, upgrading to iOS 4.3.5 holds very little incentives but if you are not jailbroken or is already on 4.3.4, then by all means please upgrade to the latest iOS firmware. Don't worry about being able to jailbreak your device because the latest version of Redsn0w works with iOS 4.3.5, although it is a tethered jailbreak. It has been tested and it works on all iOS devices except of course for the iPad 2. This bit of information was also confirmed by iPhone Dev Team frontman Musclenerd himself:
MuscleNerd Tweet 4.3.5

ah ok thanks for checking! So those who really do want tethered 4.3.5 can use redsn0w pointed at 4.3.4 (except iPad2)

WARNING: Those you who are currently in iOS 4.3.3 and below and is enjoying an untethered jailbroken device, then DO NOT upgrade to the iOS 4.3.5 or even 4.3.4 because you will lose your untethered jailbreak.

Steps on How to Jailbreak iOS 4.3.5 Using Redsn0w (Tethered):

  1. First, you will be needing two iOS firmware IPSW which are iOS 4.3.5 and iOS 4.3.4 (required by Redsn0w). IPSW download links are provided at the end of the guide. Make sure that your device is properly plugged into your PC or Mac.
  2. Restore your device to the firmware that you are wishing to jailbreak your device into through iTunes, in this case, the iOS 4.3.5. Make sure that you are running the latest iTunes version (iTunes 10.4).
  3. After restoring, download the latest version of Redsn0w (0.9.8b4) for Windows and Mac, if you haven't already. Download links are provided below the guide as well.
  4. Now launch Redsn0w and you will be asked to browse for an IPSW file. Browse for the iOS 4.3.4 IPSW (not 4.3.5). Once the IPSW is successfully identified by Redsn0w, click on Next.
  5. Redsn0w for Windows (IPSW Identified)

  6. On the next screen, you will be presented with the screen that enables you choose which jailbreak components would you like to install. For now, let's check only the "Install Cydia" option. Click Next.
  7. Redsn0w 0.9.8b1 for Windows (Install Cydia)

  8. On the next screen, the program will instruct you to TURN OFF your device and PLUG it into your computer. When you are ready, click Next.
  9. Redsn0w 0.9.8b1 for Windows (DFU Mode)

  10. Now Redsn0w will ask you to put your device into DFU Mode, just follow the simple onscreen instructions or you can refer to the short guide below:
  11. Redsn0w 0.9.8b1 for Windows (DFU Instructions)

    • Hold the Power button for about 5 seconds.
    • Now Press down the Home Button without releasing the Power button. Keep both button pressed for about 10 more seconds.
    • Now release the Power button but not the Home button. Keep the Home button pressed for 15 more seconds or so. Your device should be in DFU Mode afterwards.
  12. Once in DFU mode, Redsn0w will not start the jailbreak process. At this point, the process requires no user intervention so just sit back and let Redsn0w take care of the rest. Just do not unplug your device at all cost. Once the process is complete, Redsn0w should present you a notification.
  13. Redsn0w for Windows (Done)

NOTE: Again, keep in mind that this is a tethered jailbreak, which means when your device loses power or be turned off for any reasons, you will be stuck in the Apple logo boot up screen. To kick your device out of that infinite loop screen just plug in your device and perform the steps above up to step 4. Now in step 5 instead of selecting the "Install Cydia" option, check the “Just boot tethered right now”. You will need to do this for every time your device powers off or reboots.
Redsn0w for Windows (Boot Tethered)

Download Links:

Download iOS 4.3.5 IPSW for iPhone 4, 3GS, iPod touch and iPad
Download iOS 4.3.4 IPSW for iPhone 4, 3GS, iPod touch and iPad
Download Redsn0w 0.9.8b4 for Windows
Download Redsn0w 0.9.8b4 for Mac
Download iTunes 10.4 for Mac and Windows

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    chris8 years, 11 months ago

    i need unthered ios for iphone 4 base banda 4.10.01 ios 4.3.5

      Pramod8 years, 11 months ago

      Not possible. Only a tethered JB is available for iOS 4.3.4+.

    Zack9 years ago

    Ok pramod so your saying whenever i download something on cydia and it goes through the download process stuff.And i click reboot and it reboots it but it gets stuck on the apple boot logo your saying that to just boot tethered and everything will be ok??? And will i still have whatever i downloaded from cydia after i boot it??

    Zack9 years ago

    So i would have to do that on everything i install on cydia???

      Pramod9 years ago

      No, each time you reboot / shut down your device you need to repeat the same instructions to boot it back up.

    Zack9 years ago

    OK, so i have jailbroken my ipodtouch 4th generation and have booted it tethered and so whenever i open up cydia and try to install it like for example witerboard it downloads it real quick but whenever i have to respring it gets stuck ok the apple logo forever until it runs out of battrey

      Pramod9 years ago

      You would need to use Redsn0w’s Just boot Tethered Now option to boot your device back up being on a tethered JB.

    Nicolas9 years, 1 month ago


    i took al the downloadsteps you said i need and when i start redsnow theire is no problem… only when i browse i cant find the files… (4.3.4)&(4.3.5= isn’t nessecery but i cant fint them

    what’s wrong?

      Pramod9 years, 1 month ago

      If your looking forward to jailbreaking your iPhone on iOS 4.3.4+, use the latest version of Redsn0w0.9.9b1. Make sure that your connected to the internet always.

    Canasia9 years, 1 month ago

    After following the above instructions redsn0w said Done! my phone went into reboot and stuck on the apple logo.
    please help!

      Pramod9 years, 1 month ago

      You will still need to boot tethered each time you reboot your device using the Just Boot Tethered Now option using Redsn0w. That’s called a tethered JB.

    fabio9 years, 1 month ago

    Man, BOOM! Its working! Thank you very much! It took me 4 days until your tips!

    As described, it reaaly take time to the sinal became active after gevey message. But now its ok! 4.3.5 + JB + gevey pro.

    Thumbs up!! If you plan to visit Brazil someday, email me and Ill pay you a capirinha with feijoada!

      Pramod9 years, 1 month ago

      Your most welcome !! Sure I will !! Glad to know that my tip worked for you !! :D

    fabio9 years, 1 month ago

    Im trying to unlock my Iphone 4 4.3.5 baseband 04.10.01 with gevey, but there is no way to do it.
    Without jailbreak(only restored with iTunes to 4.3.5), the gevey works. After jailbreak, trhough redsn0w thetered reboot, activated through iTunes with original AT&T sim, the gevey method doesnt work.
    I can see the gevey message (in chinese here), accept, 112, airplane… but the signal here doesnt appear.
    Does 4.3.5 + gevey doesnt work/ Should I upgrade to gevey ultra?
    Thanks from Brazil

      Pramod9 years, 1 month ago

      The Gevey Supreme Red does definitely work with 4.3.5. But again I’m not quite sure if the JB has anything to do with Gevey itself because it doesn’t depend on one either. The Ultra too does have issues with Redsn0w to get it up & running. Try this, boot the iPhone in tethered mode with the Gevey SIM inside. Ignore the Gevey message by hitting Cancel. Next, go upto Cydia & install Ultrasn0w. It’ll have you respring. You wont have to reboot your phone for the Gevey SIM message to pop up again. Just wait for a few seconds & BOOM. This time turn off the Wi-Fi and then do the usual 112 steps. It takes time to get the signal to your phone. In case you mess up or something goes wrong, just turn your wifi on and REINSTALL Ultrasn0w and then respring turn wifi off then repeat the steps.

      Try this out & let me know how it goes. Its an advice that I had read somewhere regarding the Redsn0w JB incompatibility on 4.3.5.

    Q8Ryuk9 years, 1 month ago

    that’s great !! works fine with me :)

    Alberto9 years, 1 month ago

    Hi Pramod,

    I need your help please!

    I recently jailbreak and unlock my iPhone 3GS 4.3.5 and updated to BB 06.15.00. Now my iP3GS is running iOS 4.1 with BB 06.15.00 amd is working fine. It is an untethered jailbreak and i do not have any problem with the battery. My question is, can I update the current fw to 4.3.3 via redsnow or snowbreeze without loosing the unlock?

    Thanks a lot in advance!

      Pramod9 years, 1 month ago

      Only if you have the necessary SHSH saved for that iOS version to which you wish to update/restore to either by Cydia ( / TU.

    karl9 years, 1 month ago

    cydia doesnt work when you do this…

      Pramod9 years, 1 month ago

      It will obviously work only if you have boot your iPhone tethered using Redsn0w each time you switch OFF or reboot your device. That’s what’s called a tethered JB.