The QUnlockTool Sony works by connecting your Sony Xperia device to your computer via USB. The tool then communicates with the device to unlock the bootloader. The process involves:

Dial *#*#7378423#*#* > Service info > Configuration > Rooting status to see your current status.

: Requires a PC connection using specific Sony 32-bit or 64-bit drivers and putting the phone into a specialized connection mode (often by holding Volume Down while plugging it in).

While QUnlockTool is a powerful tool, it's essential to understand the risks involved in using it: