If the phone is operational and accessible, the most straightforward approach is using the built-in software menu. This is often referred to as a factory data reset. Open the and navigate to Settings . Locate the Personal section and select Backup & reset . Tap Factory data reset .
Follow the on-screen instructions. When asked, connect your Xperia J to the computer while holding the Volume Down button. How to Hard Reset SONY Xperia J ST26i
A hard reset takes time and requires a stable power source. If your phone dies in the middle of the reset process, the operating system could become corrupted, leaving your phone "bricked" (unusable). If the phone is operational and accessible, the
Download and install on your PC or Mac. Open the software and select Software Repair . Locate the Personal section and select Backup & reset
To ensure your private data is completely removed. Summary
Note: Some variants may require holding Volume Up + Power or both Volume buttons + Power. Volume buttons to highlight "wipe data / factory reset" and press the Power button to select it. "Yes — erase all data" and confirm. Once finished, select "reboot system now" Method 3: Service Dialler Code