[Update 1] As always, this version for all devices except iPad 2 is capable of a “tethered” jailbreak. i0n1c, the hacker behind untethered jailbreaks for 4.3 – 4.3.3, says not to expect an untethered for 4.3.4 anytime soon. Since all this update does is patch out JailbreakMe 3.0 there’d be no benefit from upgrading to this firmware so, STAY AWAY FROM IT 🙂
If you want to stay jailbroken and unlocked stay away from the latest iOS 4.3.4 update that was just released. As soon as the iPhone Dev Team says it is OK to upgrade we will let you know.
So far the only changes that we know of is that they blocked Jailbreakme.com which took advantage of a PDF exploit. More details will follow as soon as we have them.
You can find the iOS 4.3.4 and all other iOS downloads here: iOS Software Downloads