Patched: Bootloader Unlock Allowed No To Yes

Power off the phone and connect it via USB while holding the Volume Down button (to enter Flash mode).

Put a SIM card from a different network into your phone. bootloader unlock allowed no to yes

For macOS and Linux users, no additional drivers are typically required. Power off the phone and connect it via

How to unlock and re-lock the bootloader - Support - Fairphone bootloader unlock allowed no to yes

Which is the phone originally from? What Android version is your device currently running? Share public link