: Ensure the Xperia X Performance drivers are installed on your PC to ensure the device is recognized in flash mode. Removal of Screen Lock (Procedure) Flashing firmware will erase all user data .
: The most reliable way to find specific regional firmware is via the XperiFirm tool , which allows you to select the "
: Choose the downloaded 502SO 340 R13C file. In the "Wipe" pane, ensure USERDATA is checked to successfully remove the screen lock. Connect Device : Power off the phone.
: Download the latest version of Sony Flashtool to handle the .ftf file.
Hold the button while connecting it to the PC via USB. The LED should turn green (Flashmode).
: The tool will begin writing the firmware. Do not disconnect until the process is marked as finished. Alternative Official Recovery
" model and the "SoftBank JP" region to find version (referenced as 340).
If you prefer not to use third-party flash tools, you can use official software: Xperia X Performance driver | Developer World
