Geohot has fixed some of the bugs from the first release in blackra1n RC2.
According to Geohot, blackra1n RC2 fixes the following issues:
Fixed 3G issues
Tethered jailbreak for 3.1 OOTB ipt 8GB and new 3GSes
Fixed Icy issues
He has released the updated version of blackra1n for both Windows and Mac users.
If you had problems jailbreaking your iPhone using blackra1n RC1 then you can try using the new version. If you managed to successfully jailbreak your iPhone using the earlier version then you don’t need to rerun it.
Please remember that he had issued the following warning for iPhone 3G and iPhone 3GS users who want to unlock their iPhone:
Warning 3g and 3gs unlockers, do not upgrade to 3.1.2 using iTunes if you want to keep your unlock. Baseband cannot be downgraded. Check out the dev team's offerings. Also blackra1n doesn't hacktivate.
So if you want to unlock your iPhone then you should use iPhone Dev Team’s PwnageTool 3.1.4, which allows you to jailbreak iPhone OS 3.1.2 and also preserve the baseband so you can use UltraSn0w to unlock it.
If you don’t care about unlocking then you can download blackra1n from here.
If the solutions works for you, don’t forget to drop over at the blackra1n’s website to give Geohot a donation for all his hard work.
As always, let us know how it goes in the comments.[via Geohot’s blog]