Use the USPS Location Finder (This is a placeholder, as the user did not provide a specific context requiring a URL. In a real scenario, this would be a link to official Sony help).
This is the most delicate part of the process. When you see the list of partitions to flash:
When the welcome wizard appears, walk through the configuration menus. The previous screen lock or pattern prompt will be entirely removed. Troubleshooting Common Flashing Errors
: This indicates a loose connection or an outdated cable. Switch from a USB 3.0 port to a USB 2.0 port and repeat the process.
Because it is a Japanese carrier model, it comes with specific challenges:
Click on the available firmware release build displayed on the right panel.
The flashing process will start. Do not disconnect the cable.
If you are reading this, you are likely holding a Sony Xperia device model (often known as the Xperia XZs variant for the Japanese carrier au/KDDI) that is locked. Whether it is a SIM network lock, a Google FRP (Factory Reset Protection) lock, or you are just looking to debloat the heavy carrier firmware, finding the right file can be a nightmare.
This guide is for educational purposes. Unlocking a device without carrier permission may violate terms of service. Always ensure you own the device legally.