Redsnow is easy to use, it is available for Windows and Mac OS. Pwnagetool can be used to create custom ipsw and preserve baseband, it supports Mac OS only.
Ultrasn0w doesn’t work on iOS 4.3.1 yet (even with iOS 4.3.1 + old baseband). The fix will be available soon. Here’s a warning from DevTeam for unlockers:
ultrasn0w users don’t update yet! We need to first release an update to ultrasn0w that fixes some incompatibilities when FW 4.3.1 is used on the older basebands supported by ultrasn0w. And remember once we do fix ultrasn0w for 4.3.1 (we’ll announce it here and on twitter), you must only get there via a custom IPSW from PwnageTool, Sn0wbreeze or xpwn! Don’t ever try to restore or update to a stock IPSW, or you’ll lose the unlock!
Redsnow is easy to use, it is available for Windows and Mac OS. Pwnagetool can be used to create custom ipsw and preserve baseband, it supports Mac OS only.
Ultrasn0w doesn’t work on iOS 4.3.1 yet (even with iOS 4.3.1 + old baseband). The fix will be available soon. Here’s a warning from DevTeam for unlockers:
Hacker I0nic has given his untether exploit for the iOS 4.3.1 jailbreak to the iPhone Dev-Team. They will perform testing and integrate it into their jailbreak utilities – redsn0w and pwnagetool. This untethered jailbreak will probably work for iPhone 3GS, iPhone 4, iPod Touch 3G, iPod Touch 4G and iPad.
The iphone-dev-team is already beta-testing the untether. So it is up to them to give you your tool of choice.
Please don’t bother the dev-team now. The deal is: if the beta test is successfull, they are free to do whatever they want with it.
Hackers have released Sn0wBreeze 2.4 beta 1 utility, which is able to jailbreak the latest iOS 4.3.1. This jailbreak is tethered for iPhone 4, iPhone 3GS new bootrom, iPad, iPod Touch 3G, iPod Touch 4G. Tethered means that every reboot you will have to connect device to a computer and boot it using special utility (iBooty). Sn0wBreeze 2.4 beta 1 provides untethered jailbreak for iPhone 3GS old bootrom.
Sn0wbreeze also preserves your baseband, which is very useful for unlockers. Using Sn0wbreeze you can update firmware iOS 4.3.1, while preserve old unlockable baseband. It also works with iPhone 3GS with 06.15 baseband.
It is still beta, so there might be bugs so use at your own risk.
You can download Sn0wBreeze 2.4 beta 1 for Windows here.
Hackers released Sn0wBreeze 2.3 beta 4 utility, which is able to jailbreak the latest iOS 4.3. This jailbreak is tethered for iPhone 4, iPhone 3GS new bootrom, iPad, iPod Touch 3G, iPod Touch 4G. Tethered means that every reboot you will have to connect device to a computer and boot it using special utility (iBooty). Sn0wBreeze 2.3 beta 4 provides untethered jailbreak for iPhone 3GS old bootrom.
Sn0wbreeze also preserves your baseband, which is very useful for unlockers. Using Sn0wbreeze you can update firmware iOS 4.3, while preserve old unlockable baseband. It also works with iPhone 3GS with 06.15 baseband.
You can download Sn0wBreeze 2.3 beta 4 for Windows here.
The Chronic Dev Team has released Greenpois0n RC6.1, a new version of their ‘untethered’ iOS 4.2.1 jailbreak tool which now includes an update that disables Apple’s means of protecting the iBooks application from jailbreakers.
Recent Greenpois0n changelog:
RC6.1: comex ‘hunnypot’ iBooks fix, don’t overwrite animate if it already exist
RC6: Apple TV 2 support, fixed emulators compatibility issues with greenpois0n
Untethered iOS 4.2 jailbreak GreenPois0n has just been upgraded to version RC6. New version includes support for the Apple TV 2G. GreenPosi0n will give your Apple TV an untethered jailbreak and will also install the popular NitoTV software on it. RC6 also fixes emulator issues. So if you had problems with RC5 go ahead and try this one. You can also apply RC6 over RC5 without restoring.
You can download the latest GreenPois0n version here.
These are step-by-step instructions on how to jailbreak iOS 4.2.1 on iPhone 3GS, iPhone 4, iPad, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G using Greenpois0n for Windows. Tutorial for Mac OS X users is available here. All the steps are the same for all devices, we will cover iPhone.
Greenpois0n has been updated to support the iOS 4.1 and iOS 4.2.1 firmware. Use Limera1n if you want to jailbreak iOS 4.0, iOS 4.0.1, iOS 4.0.2.
Remember: Greenpois0n recommends a clean restore before continuing.
Unlockers: do not update to iOS 4.1 or iOS 4.2.1 if you need the unlock. Ultrasn0w does not support that baseband yet. The only exception is the iPhone 4. Experienced users can also try update to iOS 4.2.1 without upgrading your baseband by using TinyUmbrella. Start TSS Server->Start iTunes->Plug in your iPhone->Restore 4.2.1->Error 1013->Put phone into DFU Mode->Launch Greenpois0n.
We are not authors of this app. We do not promise that everything will go well, use this tutorial at your own risk.
Step One
Open your web browser and download the latest Windows version of GreenPois0n from here.
Step Two
When prompted save the download to your desktop.
Step Three
Double click the downloaded gp_win_rc5_b2.zip file then drag the greenpois0n.exe file to the desktop. Double greenpois0n.exe from the desktop to launch the application
Step Four
Connect your iPhone to the computer, power it off. Then click the large Prepare to Jailbreak (DFU) button in greenpois0n app.
Step Five
You will now be instructed on how to place your iPhone into DFU mode.
You will be asked to press and hold the sleep button (power button) for 3 seconds.
Now continue holding sleep button and and press home for 10 seconds.
Release sleep button and continue holding the home button. Do not release the Home button at this point!.
Step Six
Once your iPhone is successfully in DFU mode you may click the Jailbreak button. You need to continue holding the home button.
Step Seven
Greenpois0n will now jailbreak your device.
Click the Quit button once the software application has completed. Now you can release the Home button.
You’ll notice some text scrolling on your device.
Step Eight
After the iPhone restarts you’ll see a new Loader application on your Springboard. Press to launch it.
Step Nine
Select Cydia then press the large Install Cydia button that appears. Now Cydia will be downloaded from internet, so you need internet connection through wi-fi or edge/3g.
Step Ten
Once Cydia has installed successfully you can remove Loader by pressing the Options button then the large red Remove Loader.app button.
Step Eleven
Restart your iPhone and run Cydia. Let it do all the necessary updates.
You’re done!
Update:To change the boot logo back to Apple: install “Apple Boot Logo” from Cydia, then go to Settings-BootLogo and select Apple Logo.