Often referenced in tutorials for hard-locked devices, this often refers to SETool2 , which is a professional, paid hardware/software suite used by mobile technicians rather than a free online tool.
If you are looking to unlock your Sony device, it is highly recommended to use official or verified professional methods: Often referenced in tutorials for hard-locked devices, this
Sony provides a dedicated Bootloader Unlock service for developers. You can check eligibility by dialing *#*#7378423#*#* and navigating to Service info > Configuration > Rooting Status . this often refers to SETool2