As you know, Apple has released iOS 4.3.4 to prevent you from jailbreaking your device with JailbreakMe. You’re advised to stay away from the upgrade if you need jailbreaking.
Just in case you’ve accidentally upgraded to iOS 4.3.4, the iPhone Dev team offers an alternative jailbreaking solution for you. The team has released redsn0w 0.9.8b3, one of its popular jailbreaking tools, to support jailbreaking on iOS 4.3.4.
For the convenience of kernel hackers like @comex and @i0n1c, we have a new redsn0w 0.9.8b3 that supports a TETHERED jailbreak for iOS 4.3.4 on all devices that have 4.3.4 except the iPad2. The vast majority of people will want to stay back at 4.3.3 because that?s where the untethered jailbreak is! There are no new features in 4.3.4 ? only fixes for jailbreak exploits.
Also, this is a good time to remind everyone (since we?re still seeing confusion about this): iPad2 owners with a baseband (3G or CDMA) cannot currently use saved blobs to go back to 4.3.3 once the signing window is closed. This is unlike every other device, so don?t be confused! iPad2 owners with basebands should stay away from all updates to maintain the jailbreak!
At the mean time, only tethered jailbreak is supported on iOS 4.3.4. That means every time you need to reboot your device, you have to connect to computer and use redsn0w to boot it up. Also, redsn0w doesn’t support iPad 2 yet.
To download redsn0w 0.9.8b3, you can check out the following links:
As a kind reminder, the iOS 4.3.4 does not offer any new features. The primary purpose is to close a security bug that makes jailbreaking (via JailbreakMe) possible. If you need to use JailbreakMe, you should avoid the upgrade.