The automatic reboot security feature (also called auto reboot after update or scheduled reboot) is a system-level function that allows the device to restart automatically under certain conditions — but keeps your personal data safe.

It was introduced in Android 11 and improved in later versions like Android 12 and 13.

🔑 What Does It Do?

✅ After a system update:

If your phone installs a security or system update overnight, it can reboot automatically and complete the update without waiting for you to enter your PIN, pattern, or password right away.

✅ Keeps data encrypted:

Your device stays file-based encrypted during the reboot. Android uses a special mechanism called Resume on Reboot so background apps (like alarms or incoming calls) can work even if you haven’t unlocked the phone yet.

✅ Improves security:

This ensures:

Your phone applies the latest security patches as soon as possible.

You don’t skip updates just because you forgot to reboot manually.

⚙ Where to Find It?

On most devices:

Go to Settings → System → Advanced → System update.

Look for options like Auto reboot after update or Schedule reboot.

Some Samsung phones have a similar feature under Device care → Auto restart.