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.