This is expected behavior. Google Pixel devices show a “Your device is loading a different operating system” warning when the verified boot process detects a custom OS — such as GrapheneOS — instead of Google’s stock Android.

This message appears because:

• GrapheneOS replaces the factory-signed firmware with its own cryptographically signed OS

• The bootloader remains locked and secure, but the OS is not signed by Google, so the device shows a cautionary prompt

✅ There’s no danger — your phone is still secure.
In fact, this message is a good sign: it means verified boot is working, and your OS hasn’t been tampered with.

🔒 SecureFone devices are fully verified and locked before shipping. The bootloader warning simply reflects your choice to run a privacy-respecting, custom OS.