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.
UPDate 2: Attention! We’ve received info, that Apple stopped signing iOS 4.2 for devices for which iOS 4.3 is available. This means you will not be able to restore to 4.2.1 without saved SHSH keys.
Using this tutorial you will be able to jailbreak iOS 4.2.1 running on iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 3G, iPod Touch 4G and iPad. Pwnagetool will also preserve baseband version if you need carrier unlock. If you have updated the baseband to version 06.15, you can use this tutorial. This tutorial uses PwnageTool 4.2 for Mac OS X.
We are not developers of jailbreak utilities, so we cannot assure that everything will work just fine. However we tried this tutorial on several devices and succeeded.
We will use iPhone 4 in our jailbreak tutorial. The process is the same for all devices.
Step One
Make a folder called “Pwnage” on the desktop. Download a couple of things:
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
DevTeam released PwnageTool 4.2 utility. It is able to create a custom IPSW that can perform an untethered jailbreak on iOS 4.2.1. As usual it can preserve baseband version for unlockers. Devteam used the same method that was implemented in greenpois0n.
PwnageTool supports all 4.2.1 devices other than iPod touch 2G:
DevTeam released PwnageTool 4.2 utility. It is able to create a custom IPSW that can perform an untethered jailbreak on iOS 4.2.1. As usual it can preserve baseband version for unlockers. Devteam used the same method that was implemented in greenpois0n.
PwnageTool supports all 4.2.1 devices other than iPod touch 2G:
Jailbreak is even improved compared to GreenPois0n RC6:
PwnageTool also includes two very recent improvements to the 4.2.1 JB: iBooks was just fixed by @comex and @pushfix last night so that it works as intended on DRMed books, and the wifi problem on AppleTV 2G was fixed by @nitotv, @DHowett, and @saurik. Both of these fixes will also be available in upcoming Cydia package updates, so if you’re already jailbroken you can wait for those updates rather than restore and jailbreak again.
You can download the new PwnageTool from here. We will post tutorial for PwnageTool 4.2 soon.
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.