I didn’t tell my MacBook to update, now it’s updating. Is it too late

EvilGMusic Said:

"I didn’t tell my MacBook to update, now it’s updating. Is it too late: can I reverse an updating MacBook. I didn’t tell it to update. All I did was hit restart"

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Use a Time Machine Backup:

Did you backup your Mac, recently? If so, then restore your Mac from that. You'd backup you Mac prior to doing so, and then restore your data from the backup you just created, through use of Migration Assistant.

Hi EvilGMusic,

Sorry to hear that your Mac unexpectedly started an update. Please allow it to finish the update. Forcing it to stop could damage macOS and/or your data.

To ensure that your Mac doesn't install updates automatically in the future, go to System Preferences -> Software Update -> Advanced, and uncheck "Install macOS updates".