: Never attempt to relock the bootloader if you are running a custom ROM (like LineageOS), as this will likely brick the device . You must flash a stock Sony ROM before attempting to relock. Are you looking to use this tool on a legacy 2011 device , or are you trying to relock a modern Xperia

Use a computer with ADB/Fastboot installed and run: adb reboot bootloader Alternatively, use hardware buttons (commonly Volume Down + Power ) while the device is off.

Unlocking often wipes the TA (Trim Area) partition . This can permanently degrade camera quality (noise reduction) and disable proprietary display features like X-Reality or Bravia Engine.

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