Can't unlock my N5

So i have the same problem as this video (http://youtube.com/watch?v=3dQGgcNvamc)
I Did everything same as tutorial, when i finish the unlock bootloader screen show it's unlocked but when i do the fastboot reboot appears "lock state - locked" i have tryed many times, i confirm the unlock, i do the fastboot reboot, i wait 5 minutes but still don't work, and my nexus are bricked so i need to unlock for flash de stock firmware HELP MEEEE

Sorry for my english is not the best...

Best Regards.

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