Sony Flashtool — 0.9.18.6

This version includes an auto-root feature for older Android 4.4–6.0 devices. After flashing a stock ROM, you can go to Tools -> Root -> SuperSU . The tool will push the binary and APK automatically.

Later Flashtool versions tightly integrate XperiFirm (a firmware downloader). While convenient, this adds complexity. Version 0.9.18.6 allows you to manually add .ftf files cleanly without automatic server checks, which is perfect for offline use or using custom-built ROMs. Sony Flashtool 0.9.18.6