Flashing firmware carries inherent risks. Follow these preparation steps closely to protect your data and device:
Ensure your Xperia XZ has at least 50% battery life to prevent the device from powering off mid-flash. Official Sony Xperia XZ SO-01J -Docomo Japan- Stock Rom
The first boot process will take significantly longer than usual (up to 10–15 minutes) as the Android OS builds its initial runtime caches. Do not interrupt this process. Troubleshooting Common Flashing Errors Flashing firmware carries inherent risks
The official .ftf firmware file is essential for several critical maintenance tasks: download the latest official Docomo firmware
The tool will automatically detect the SO-01J model, download the latest official Docomo firmware, and install it. Method 2: Using Newflasher / FlashTool (Advanced)