How to Check Your Sony Bootloader

To confirm whether it is possible to unlock the Bootloader of your device, you could check the service menu.

Sony Smartphone Users

Step 1: Open the dialer and enter *#*#7378423#*#* to access the service menu.

Step 2: Tap  Service info > Configuration

Step 3: If Bootloader unlock allowed says Yes, then you can unlock the Bootloader. If it says No, or if the status is missing, your device cannot be unlocked.

Sony Tablet Users

Step 1: Open Contacts App

Step 2: Click the menu button.

Step 3: Click Settings.

Step 4: Long press (for about 5 seconds) somewhere in the empty space just above status bar, as indicated by the red frame in the screenshot below, and then release your finger. A button named Enter service code will then appear in the same area (this may take a few tries).

Step 5: Click Enter service code. A dialer will appear.

Step 6: Enter *#*#7378423#*#* in the dialer.