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With the iPhone OS 3.1 beta release, the Dev Team offers a warning
iPhonefreak — ... due to the recent release of iPhone OS 3.1 we have yet another warning coming courtesy of the Dev Team. “ultrasn0w users *must* stay away from official 3.1 (incl. betas) until we release the tools for it, or you’ll *lose* unlock !” Basically, if you are looking to unlock your iPhone at anytime in the future using ultrasn0w then you need to hold off on updating to OS 3.1 beta, and once the final version is released, OS 3.1 (the non-beta). [Twitter @iphone_dev and blog.iphone-dev.org ]

Reminder: Don't Update To 3.1 Beta If You Want To Jailbreak
iPhone Alley - RSS — ... The Dev Team posted a warning on their blog reminding users that if you want to maintain the ability to use the Ultrasnow unlock for the 3.x firmware, don't upgrade to anything past 3.0, including the recently seeded developer copy of the OS 3.1 beta. 3.1 updates the baseband, breaking the ability to be unlocked by the Dev Team's exploit. The warning applies only to 3G and 3GS devices. ...

Prepare Your iPhone 3GS For Jailbreak
iPhone Download Blog — ... yesterday suggesting that iPhone 3GS owners should prepare their device for jailbreak . Remember we warned you to stay away from any updates to 3.1 if you want to be able to jailbreak or unlock your 3GS. Well this is an additional message to all you 3GS owners that would like to jailbreak your device sometime soon, but this advice comes with a warning! A warning that if you accidentally upgrade to 3.1, you will not be able to use Ultransn0w, so please re-read and double check this warning at the bottom of this post before proceeding. During the restore process iTunes ...

Temporarily Dev-Team Country: A Workaround Jailbreak For The iPhone 3GS
iSmashPhone — ... Remember we warned you to stay away from any updates to 3.1 if you want to be able to jailbreak or unlock your 3GS. ...