Dev-Team offers warning; don�t update to the 3.0 beta if you want to keep yellowsn0w

This should go without saying, but here goes. If you are someone that likes to (or plans to) jailbreak or unlock your iPhone, then you should never perform an upgrade until you read that it is safe to do so.
Of course, this is not any different with the latest beta release of OS 3.0.
“If [...]

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[Source: iPhonefreak]