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. once i have downloaded os4gm, as i have already updated to os4 final can i just use the os4gm for redsn0w or do i have to install os4gm over the final version i have?

    Reply

  3. Imran how did you get it past the no sim screen? Do you have a dev UDID or an activated ATT sim card?

    Reply

  4. it jailbroke fine but i cant get to the main screen, it keeps saying slide for emergency. i dont have an AT&T sim, do i need one?

    Reply

  9. I'm stuck with this issue as well… Trying to figure out what the deal is. Are you using 3GS?

    Reply

  10. Could you clarify if you're using a GM build or the consumer build released today with redsnow? between your comments and your guide, it's not clear what's the right way to do this.
    ex:
    – you say to install ios4 using the method mentioned in another post, which is to just let the device updated in itunes. this would be the consumer release.
    – however in your comments, you're saying that redsnow will not recognize the consumer release cause you need to be using the GM build for it to work.

    thanks

    Reply

  11. I just wanted to make sure before I actually commited to doing this, I currently have a iphone 3g locked with 3.1.3 firmware with the 5.12 baseband. Can this unlock and jailbreak work for me? (I use Tmobile)

    Reply

  15. Does this also apply to already jailbroken iPhone 3G 3.1.2? I had used blackra1n to jailbreak it earlier.

    Reply

  17. What I meant was that my iPhone (version 3.1.2) is currently unlocked using blackra1n. Can I follow the above procedure and upgrade to iOS4? Will it delete the cracked ipa's that I have already installed?

    Reply

  18. Yes, you can upgrade it. It might erase everything so it'll be better to back up your data using iTunes first. You can restore the apps to your iPhone again after upgrading to OS 4 and jailbreaking it.

    Reply

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