Si no me equivoco el bootloader esta bloqueado de fabrica siempre, otra cosa es si se puede desbloquear o no
http://unlockbootloader.sonymobile.com/instructions
Cita:
- First, you should confirm that it is possible to unlock the boot loader of your phone by checking the service menu. In your phone, open the dialler and enter *#*#7378423#*#* to access the service menu.
- In your phone, tap Service info > Configuration > Rooting Status. If Bootloader unlock allowed says Yes, then you can continue with the next step. If it says No, or if the status is missing, your device cannot be unlocked.
Siguiendo estos 2 pasos comprobaras si a tu movil se le puede desbloquear el bootloader o no.