Our boy George Hotz has done it again. He released a jailbreak for iPhone OS 3.1.2 today, which stuck to his previous nomenclature, this time called “blackra1n.” As the man known as Geohot says, “blackra1n is a 30 second ALL device 3.1.2 jailbreak.” That’s right – 3G, 3GS, whatever you’ve got it works.

There is one warning, which comes from blog used to tease the jailbreak. You should not upgrade to 3.1.2 via iTunes if you have an unlocked phone. It will “fix” the unlock and you’ll be SOL. You can use PwnageTool to get up to 3.1 safely. If you’ve already lost your unlock, blackra1n can get back your jailbreak.

As with previous geohot unlocks, the download is PC only, so get with your Windows friends if you want this to work.