Turn off your phone. Hold the Back button (or Volume Down for newer 2012 models) and connect the USB cable. The LED should turn green . Relock: In the tool, click Relock BL .
here doesn’t stand for Samsung Experience or Sony Ericsson. In bootloader contexts, “SE” often refers to Secure Element or Security Extension —essentially, the part of the bootloader that enforces verified boot (AVB) and rollback protection. se bootloader unlocking relocking 1662 patched