Disclaimer: The following is for educational purposes only. Modifying your device may void warranty and violate carrier agreements.
If you absolutely must use QUnlockTool, do so on a spare PC, with a full backup of your device’s TA partition (using “TA Backup” tool), and only after verifying the tool’s hash with trusted forum members. qunlocktool sony
Conclusion: Success heavily depends on exact firmware version. Sony continuously patches the exploits QUnlockTool uses. Disclaimer: The following is for educational purposes only
Dial *#*#7378423#*#* > Service info > Configuration > Rooting status to see your current status. do so on a spare PC