HELP! HD locked on reinstall!

SOLVED: Can't reinstall MacOs because disk is locked (2nd hand MacBook) - MacBook Pro 13 Retina Display Early 2013 - iFixit

SOLVED: locked hard drive can't reinstall Lion OSX - MacBook Pro 13 Unibody Late 2011 - iFixit

HELP! HD locked on reinstall!

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HELP! HD locked on reinstall!, Page 19

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