There was one for 4.3.3 and only 4.3.3. The reason there isn't one, even a tethered one, is because the iPad 2 and 4S use the A5 which has a new bootrom, the exploit that makes the old ones tethered is a bootrom exploit, which is patched in the A5.
As for why there is no non bootrom jailbreak right now, in iOS 4.3 and up Apple implemented ASLR, which makes it extremely hard to find userland exploits.
12-04-2011 05:08 AM