Blackra1n is now available in Mac version, head over to blackra1n.com to download and if you appreciate GeoHotz’s works, please consider a donation to show your supports. Hopefully, he will work on the carrier unlock for the latest baseband 05.11.07. On top of that, iPhone dev team commented on GeoHotz’s latest iPhone jailbreaking tool – blackra1n that was released 3 days ago.
geohot released a Windows jailbreak called “blackra1n” which is similar to redsn0w in that it covers multiple devices (and it covers beyond just firmware 3.0.1 where redsn0w currently stops). blackra1n is not a carrier unlock. You must always avoid updating your baseband to maintain your unlockability. If you use blackra1n to jailbreak 3.1 or 3.1.2, the steps you take before running blackra1n will prevent the unlock from working on your iPhone for potentially a verylong time. By the way, we haven’t yet tested whether a blackra1n’d device can accept a custom IPSW without tweaks, but if it doesn’t then it should only require a minor change.