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Reinstalling OS X Mountain Lion over a FileVault 2 Encrypted Drive

August 7, 2013

1. Download Mountain Lion (on a different Mac) and copy it to a USB thumb drive

2. Hold Command-r during boot on the encrypted Mac to boot from the recovery drive

3. Go to Utilities-> Terminal, and delete the Logical Volume Group

 

You should now be able to insert the bootable Mountain Lion USB drive in the encrypted Mac, and choose the “untitled” HD you just wipes without being prompted for the FV2 password. 

 

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