ecesito desbloquear el bootloader para eso? Porque en la página de Sony me dice esto al respecto:
In your device, open the dialer and enter *#*#7378423#*#* to access the service menu.
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.
En mi celular, dice "Bootloader unlock allowed: No", por lo que aparentemente es imposible desbloquearlo.