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.
KingoRoot on Windows
KingoRoot Android on Windows has the highest success rate. It supports almost any Android device and version.
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KingoRoot for Android is the most convenient and powerful apk root tool. Root any Android device and version without connecting to PC.
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