You can jailbreak iOS 4.1 Beta 2 on iPhone 3G and iPod Touch 2G (non-MC models) with Redsn0w 0.9.5b5-5. However you might not able to unlock your device with Ultrasn0w 0.93 as iOS 4.1 Beta 2 comes up with the baseband upgradation which is yet to be unlocked by iPhone Dev Team. If you have an already unlocked iPhone 3G, then stay away from this update.
Official update from iPhone Dev Team:
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.
The procedure for jailbreaking iOS 4.1 Beta 2 with Redsn0w 0.9.5b5-5 is exactly similar to the procedure for jailbreaking iOS 4.1 Beta 1. Just restore your iPhone / iPod Touch to iOS 4.1 Beta 2 with iTunes and point Redsn0w at iOS 4.0 IPSW (final release, not the GM one). You can follow this step-by-step guide for jailbreaking iOS 4.0.1 Beta 2 with Redsn0w 0.9.5b5-5. Remember that this jailbreak will not hactivate your iPhone, moreover you might experience network problems after the jailbreak.
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