How to unlock logical Partition in recovery mode?

I have problems with my iMac (2007) after installing 10.7.2. It's not starting any more. Now, in recovery mode in Disk Utility I've clicked on Turn Off Ecryption..., because my disk is encrypted with FileVaul2. The probelm is, it's showing now as Locked and I don't find any way how to unlock it. How can I unlock it again? Thanks.

Start with http://support.apple.com/kb/HT4790. I don't use FV, so can't help with any particulars.

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