How To: Jailbreak the iPhone 3G on iOS 4

I. Before You Begin

1. This is only for the iPhone 3G on iOS 4 (aka iPhone OS 4). NOT iPhone 4 or iPhone 3GS!

2. This will work on all basebands up to 5.13.04 (check your baseband by going to Settings > General > About and looking for Modem Firmware).

3. In order to unlock the iPhone, you must do this procedure and then go to our next procedure called How To Unlock the iPhone on iOS 4 linked at the bottom of this procedure.

II. Download all the necessary files

1. Download iTunes 9.2 if you don’t already have it:

iTunes 9.2 (Windows 32 bit)
iTunes 9.2 (Windows 64 bit)
iTunes 9.2 (Mac OS X)

2. Download RedSn0w (the jailbreaking program we’ll use)

RedSn0w (choose the latest one for your operating system)

3. Download the iPhone iOS 4 firmware file

iOS 4 Firmware (iPhone 3G)

III. Jailbreak the iPhone

1. Install iTunes by double clicking the iTunes Setup file you downloaded just now.

2. Plug the iPhone in via USB cable and let it pop up in iTunes and sync it with iTunes.

3. Now, update your iPhone 3G to iOS 4 through iTunes if you haven’t already.

4. Once it is on iOS4, unzip the RedSn0w .zip file we downloaded.

5. Inside the extracted folder, right click on RedSn0w the application, and click Run As Administrator (if using XP, or Mac you can skip running as admin and just double click it).

6. In RedSn0w click Browse and search for the iOS 4 Restore file you downloaded and select it (*if the file won’t show up, see the Reported Issues at the bottom of the procedure).

7. Once it says successful, click next. On this screen check off what you want to enable (the default options are fine) and then click next.

8. Turn off your iPhone and leave it plugged in.

9. Click next in RedSn0w and it will tell you to hold certain buttons on the iPhone to get it into DFU mode. Once it is in the correct mode, RedSn0w will automatically start running. Wait for it to finish.

10. Once the phone reboots, you have a jailbroken iPhone 3G and should see Cydia listed in the apps list on the homepage.

11 (Optional). TO UNLOCK THE PHONE, continue to our next procedure: How To Unlock the iPhone 3G/3GS/4 on iOS 4

Reported Issues:

Issue: I can’t see the firmware file! It is a .zip not a .ipsw

Solution: Go to Start menu on your computer, then click on Control Panel > Folder Options > View Tab > and Uncheck Hide extensions for known file types.
Then right click the iPhone firmware file and click on rename. Take the .zip and simply rename it to .ipsw
Then you can continue.

If this procedure helped you, please consider donating to the original developer or at least sending them a thank you.

Now that you are jailbroken, head here to learn some of the fun things you can do!


Something Wrong? If you notice an issue with the procedure (broken link, steps out of date, etc.), use this form to let us know! Otherwise, if you just are having trouble with the procedure, reach out to us on Twitter, Facebook, or Google+.

  • http://www.facebook.com/william.j.reyes William Reyes

    Hi UnLockr,
    Red Snow is saying with the link posted up top, that its not available.

  • thisguy

    i downloaded the restore file, it came up as a zip file. i renamed it to .ipsw and now it says that can’t be recognized.

  • thisguy

    i downloaded the restore file, it came up as a zip file. i renamed it to .ipsw and now it says that can’t be recognized.

  • thisguy

    i downloaded the restore file, it came up as a zip file. i renamed it to .ipsw and now it says that can’t be recognized.

  • thisguy

    i downloaded the restore file, it came up as a zip file. i renamed it to .ipsw and now it says that can’t be recognized.

  • Mocchakiss23

    SUCCCESSFUL JAILBREAK AND UNLOCK!!!thanks for this site, aint no techie but i tried to do as they said. even with the problem of the zip file, do not extract, yes just change the zip file to .ipsw, the only file you will extract is redsnow.

  • Leela

    The rebooting is taking an extremely long amount of time. I did all the steps, but it just won’t reboot. Help, please!

  • Jahriclark

    hey man,im trying to do this but when i opened itunes it updated the phone to iOS 4.2.1 and my modem firmware 05.15.04 … will this still work? i dont want to break it

  • Sayoniaclan

    okay i finally jailbroken it thank you but….
    cydia wont open and everytime i slide to the next page it flashes.%Pr

    • nina

      mine does the same exact thing, screen keeps flashing when i do anything and cydia will not open

  • guest111

    did all the steps but after, screen kept flickering when i touched it. won’t let me shut off the phone. just tried to restore the phone so it can be back to normal, but now itunes can’t even restore it!

    • nina

      mine does the same thing, the phone keeps flickering when i touch it and Cydia will not open

      • nina

        i just realized my phone icon disappeared too, i cannot make any phone calls

  • Niko

    NEED HELP PLEASE! The reboot screen has been going for almost 2 hours and I don’t know how to turn my phone on again to get it working. Please advise me!

  • wcs

    how do you update it to iOS4??

  • Jbplangel0713

    i cant download the itunes 9.2 will the process work with the latest version of itunes????

  • Natifajsmith

    my team mobile sim card wont show even doe my phone is jail broken what do i do