Jailbreak and Unlock iOS 4 on iPhone 3G using redsn0w [Guide]

iPhone

iOS 4 was released earlier today and the iPhone Dev Team was quick enough to release an ultrasn0w unlock for it. Thanks to the unlock, and the recently released redsn0w 0.9.5 beta 5, you can install, jailbreak and unlock iOS 4 on your iPhone 3G. Make sure you follow the instructions correctly.

Jailbreak and Unlock iOS 4 on iPhone 3G using redsn0w [Guide]

Jailbreak and Unlock iOS 4

  1. Download iOS 4 for your iPhone 3G. Place it on your desktop for easy access.
  2. Download redsn0w 0.9.5b5-4 [links at the end]. It’s available for both Mac and Windows.
  3. Download and install iTunes 9.2
  4. Now connect your iPhone 3G to your computer and using iTunes, upgrade to iOS 4. Do this the official way as described here.
  5. Now that you have iOS 4 final build on your iPhone 3G, you’ll have to jailbreak it by using the iOS 4 with redsn0w 0.9.5 Beta 5. Click browse and point it to iOS 4 firmware and follow the instructions on the screen. Remember to enable battery percentage, wallpapers and multitasking. [Vista users might need to run redsn0w as administrator] Jailbreak and Unlock iOS 4 on iPhone 3G using redsn0w [Guide]
  6. Once you’re done and the iPhone reboots, you should have a jailbroken iPhone 3G.
  7. Now go to Cydia and add the following repo http://repo666.ultrasn0w.com. Check here for how to do this. Search for ultrasn0w 0.9.3 and install it and reboot again. Your iPhone 3G is now carrier unlocked. Also remember to add this repo to Cydia http://apt.saurik.com/cydia-3.7.

Download redsn0w 0.9.5b5-4

  • Mac OSX (x86)
  • Windows

To fix and enable Push Notifications on your hacktivated/unlocked iPhone, follow this guide.

UPDATE: the guide has been updated to reflect the recent release of redsn0w 0.9.5 beta 5-4 which fixes the iBooks issue that users were reporting.

If you face any issues, don’t hesitate to ask us in the comments. We’ll be glad to help!

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305 comments

  1. US AT&T, I have seen other reports of people of people on other carriers need the APN. So my notes above are just with US AT&T.

    Reply

  2. If you were in Airplane mode before the upgrade/jailbreak/unlock then you need to turn airplane mode on again (even though it says it is off) then turn it off and you should be good. Same happened to me.

    Reply

  3. hey imran i really need ur help. every time i download the 4.0 firmware from this or any website it comes up diffrent…. like redsno dosent recognize it and it dosent even look like a firmware. i dont know what to do withought the firmware im stuck with no phone plz help

    Reply

  6. Go to Folder Options [Type in start menu search], go to the view tab, and uncheck 'Hide extensions for known file types'. Now select that firmware file, right click it and select rename. Change the '.zip' part to '.ipsw'. This should fix it.

    Reply
  8. Pingback: Jailbreak and Unlock OS 4.0 on iPhone 3g and 3gs | Random Critic

  9. gets stuck on downloading jailbreak data. Using Mac OSX. Tried 3 times but unable to jailbreak. Any clues?

    Reply

  11. @Imran, I am currently on iPhone 3G (version 3.0) with baseband 4.26.08, will the Ultrasnow JB and unlock my current phone on OS 4.0?
    Thanks brother.

    Reply

  15. i still get the 'no service” message after toggling with the airplane mode, several reboots and restores!
    i don't know what i'm doing wrong, any ideas?
    i have a 3gs on 3.1.3. thanks

    Reply

    1. i followed the redsn0w jailbreak directions then used ultrasnow to unlock. all went just as planned and the 3G on the IOS4 is jailbroke. Only thing i wonder is if it is truly unlocked. The carrier still says AT&T. should it still say AT&T? the Sim card is not in it. I plan on selling it.

      Reply

  19. I lost my MMS capabilities after jailbreaking. I had them with the regular 4.0 ISO. Any suggestions other than restoring?

    Reply

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