Apple has released a new version of iOS 4.1 beta 2 for iPhone 4, iPhone 3GS, iPhone 3G and iPod touch 2G. This new version contains a new baseband 05.14.01_BL01 for iPhone 4, 3GS and 3G, so if you rely on unlock, don’t update your iPhone to this beta build.
Musclenerd has confirmed that Redsnow 0.9.5 can jailbreak the iOS 4.1 beta 2 on iPhone 3G and iPod Touch 2G (Non-MC) but you may experience some problem.
If you’ve updated to 4.1beta2 on iPhone3G or iPod2G(non-MC), you can use this redsn0w from June to jailbreak. Just point it at the 4.0 IPSW (the public one, not the developer GM one).
(Yes – point it at the 4.0 IPSW even though you’re at 4.1beta2).
Don’t do this if you need the ultrasn0w carrier unlock!!
Note 1: This won’t hacktivate your iPhone3G – but for those with legit access to the 4.1beta2 this shouldn’t matter. Please don’t pirate Apple software
Note 2: If you’re at 4.1beta2 you’ll probably experience network problems after jailbreaking. Until a new version of redsn0w is released, you may need to rely on afc2 access (such as FunBox-like file browser programs) to manipulate your filesystem.
Note 3: This is recommended only for power users who can deal with the problems that will pop up as the JB apps fall further behind the beta firmwares.
Here are full instruction to jailbreak your iPhone 3G with Redsnow 0.9.5 and for iPod Touch 2G, head over to this post.