Locked MacBook
How do I unlock a lost device that was now found
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Taken directly from the article: https://support.apple.com/en-us/HT204756
After you locate your Mac, you can unlock it with your passcode. Make sure to use the passcode that you created when you locked it with Find My Mac, not your device passcode.
Here's how to see the passcode that you used to lock your Mac:
- Sign in to icloud.com/find on a Mac or PC.
- Select your Mac from the Devices menu.
- Select Unlock. After you follow the steps to verify your identity, you'll see the passcode that you need to unlock your Mac.