This is Sony’s official desktop application for flashing official software onto unlocked Xperia devices. Download: Official Sony Developer Portal
A highly popular third-party tool compatible with older Xperia models (S1 protocol) for flashing .ftf firmware files and rooting. Download: Lo4d Download or Softpedia sony mobile flasher tool download
Depending on your device age and specific goals, there are three primary tools used for flashing Sony mobile devices: This is Sony’s official desktop application for flashing