Stiles, Malia and others in “Unfinished Business”

Stiles

I stole this last night off an orderly... But, it's useless, 'cause they reset the codes each night.

Malia

So, why did you take it?

Stiles

I'm getting to that.

Scott

The only way to get Lydia out of Eichen is to make that keycard work again.

Liam

How are you gonna do that?

Stiles

We're getting to that, okay? Just listen. Two weeks ago, there was a brownout, and the security system rebooted. During a reboot, all of the keycards revert back to a default code.

Liam

So, if we trigger a reboot, the card goes back to the default code, it works again!