RedSn0w is able to jailbreak iOS 4.1 beta 2
Here's some info from the DevTeam wiki page:
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 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.
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