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!

About the Author

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305 comments

  1. hey Imran. what happened to the MMS? why i can no longer attach photo in messaging? help please. thanks

    Reply

  2. my iphone is blank after unknowingly upgrade ios4 to my unlocked iphone. Anyway to get it back to work?

    Reply

  3. Thanks for the easy to follow guide Imran. I did as described by you and I sucessfully JB & Unlocked by redsn0w and ultrasnow my 3G set. I am on ios4 now thanks to your guide. I have an issue by the way ” I can make calls and I can receive calls , my wi-fi works fine but the only thing not working is my Edge ( E ) connection for which i cant send / receive email nor can i surf the web , basically my GPRS connection does not work. My ” Cellular Data is ON in my network settings and also the ” E ” is displayed near my service provider ( India Airtel ) and signal bar area. I tried doing Reset Network settings a couple of times + Airplane mode on and off a couple of times+ Cellular Data On and Off a couple of times …..but still my GPRS / EDGE is not working. Pls Help. I am 100% sure that this is not a network issue as the same SIM Card works perfectly well on my Nokia E61i.

    Reply

    1. I have the same problem… I have the iphone 3G and updated to 4.0 JB and unlocked but now my internet don’t work. Everything is working, I can make/receive calls, texts but can’t access my e-mail or cydia or app store with my carriers data service.

      Reply

  6. After unlocking my 3G phone can't find GSM operator, all other work exectly. Please help me to enable GSM

    Reply

  7. Imran any word on a fix for the mms? everything else works great! thanks for all your hard work!

    Reply

  8. Sounds like you need to unlock (redsnow only jailbreaks). Connect to wifi, then use Cydia to add repo666.ultrasn0w.com (the “0” in snow is actually a zero), then download Ultrasn0w and install it. Your iphone will reboot and should now be unlocked, and your signal should come back in.

    Reply

  9. hellow imran bhai,

    my iphone was on 3.1.3 with 5.12.01 firware and its locked, and then i upgrade my i phone with 4Os, so can u help me how can i jailbreak and unlock and active my apple i phone, right now i am india and using vodafone network so please help me as soon as possible. my mail id is : taherul.111@gmail.com

    Reply

  10. Imran,

    I had my 3Gs jailbroken and I'm assuming my gf who thought she was being sweet, hit update iPhone on my iTunes. So now I have 4.0 and it is no longer jailbroken. Because of that, my 3G internet does not work and my MMS is none existant. What can I do to restore this? I contacted AT&T(didn't mention it was previously jailbroken) and they have no idea what to do. Is there anyway that I can downgrade to 3Gs 3.1.3 7318 or am I stuck until I either have enough $$ for the new one?

    Reply

  11. I cannot open the Redsnow zip, my computer says, “Compressed folder…is invalid.” I'm running Vista (I believe as administrator). Any ideas?

    Reply

  12. I have this same issue with US Tmobile. None of the situations above helped me either, and restoring and jailbreaking again didn't work either. Any help appreciated.

    Reply

  13. Hmm unlocked via redsnow, but cant get any cellphone signal at all! iphone 3g on ios 4.0. Can anyone help?

    Reply

  14. hey! i've got the same problem but with a provider in the netherlands. have you find any sollutions??

    Reply
  18. Pingback: How to Jailbreak iPod Touch 2G with iOS 4 using sn0wbreeze 1.6.1 [guide] | Apple | ithinkdifferent

  19. i am using i phone 3gs, .. so what should i have to now for jailbreak and unlock and active for apple iphone 4os … please help me .. i cant use my apple i phone since last 4 months.

    Reply

  20. you had the same issue … but did you unlock it in a different manner before sn0wbreeze ? because … gprs doesnt work for me too …

    Reply

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