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]](https://cdn.ithinkdiff.com/wp-content/uploads/2010/06/Screen-shot-2010-06-22-at-4.59.42-AM.png)
Jailbreak and Unlock iOS 4
- Download iOS 4 for your iPhone 3G. Place it on your desktop for easy access.
- Download redsn0w 0.9.5b5-4 [links at the end]. It’s available for both Mac and Windows.
- Download and install iTunes 9.2
- Now connect your iPhone 3G to your computer and using iTunes, upgrade to iOS 4. Do this the official way as described here.
- 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]](https://cdn.ithinkdiff.com/wp-content/uploads/2010/06/Redsn0w-0.9.5-Beta-511.jpg)
- Once you’re done and the iPhone reboots, you should have a jailbroken iPhone 3G.
- 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!
Do I have to use iTunes 9.2 ? can I use any newer versions of iTunes ?
how about push notifications?
https://www.ithinkdiff.com/how-to-enable-push-notifications-on-unlockedhacktivated-iphone-with-ios-4-using-push-doctor-862312/
how about activating the phone as i do not have the sim that the phone is locked to please help
Just remember, don't update yet it if you have to hacktivate your iPhone.
I have an iPhone 3G on 3.1.2 jailbroken and unlocked for T-Mobile. I shouldn’t be updating to 4.0 and doing this procedure on my iPhone yet?
You should. It’ll work fine!
what about push notifications? that still is an issue with some people. Currently, they work perfectly on my jailbroken/unlocked iphone 3g 3.1.2 right now. are your push notifications working properly?
Yeah, whoops, T-Mobile user and now i'm jailbroken but stuck at the no sim screen lol.
You shouldn't be stuck at the no sim screen after jailbreak. You should be
able to use Cydia and download ultrasn0w to unlock it.
I've got it working fine for me.
The ultrasn0w part in the guide is for activation.
3gs ok?
You can try this on a 3GS with old bootrom. It should work fine. Not sure if
it'll work on a newer bootrom 3GS
I keep getting an error… that Redsn0w doesn't recognize IPSW
Are you sure you pointed in to iOS 4 GM build? It recognizes it fine. The
issue occurs when you point it to the final build.
i get the unable to recognize ispw
Redsn0w appeared to run it's course but i'm still stuck at the no sim screen. I'll try and re-JB. Thanks.
Are you sure you pointed in to iOS 4 GM build? redsn0w recognizes it fine. The
issue occurs when you point it to the final iOS 4 ipsw.
Can you provide link to GM build? I was under the impression that the GM build and final build were the same…
I've provided a link to the google search results in the guide at Step 1. It can be downloaded via torrents.
hey just tried to run redsn0w 0.9.5 but it says 'unable to recognise IPSW' i have updated to os 4.0? any ideas?
You need to make sure you have the right build. For 3GS the build is iPhone2 at the start of the file name, for 3G it's Iphone1 at the start of the filename.
Just re-JB and still stuck at the no sim screen. I don't believe it has hacktivation capability yet, maybe i'm not getting something here.