Launch the application on your PC as an Administrator.
: Always download the latest stable versions from reputable mirrors like Samsung Developers site to avoid malware. The Rooting Process Unlock the Bootloader Settings > About Device > Software Info and tap "Build Number" seven times. In the new Developer Options menu, enable USB Debugging OEM Unlock Flash TWRP : Put your phone into Download Mode samsung j320f root file 5.1.1 download
Turn off your Samsung J320F completely. Press and hold the Volume Down , Home , and Power buttons simultaneously for a few seconds until a warning screen appears. Press Volume Up to enter Download Mode. Launch the application on your PC as an Administrator