In the "Download" tab, click the "scatter-loading" button. Select the scatter file ( .txt ) from your firmware folder. Choose Flash Method: Download Only: Best for flashing firmware updates (safer).
Newer versions have updated Download Agents (DA files) that refuse to flash certain preloader signatures on old chips like the MT6572, MT6580, and MT6595. v5.1516 works flawlessly with these. sp flash tool v5.1516
Power off your phone, remove the battery (if possible), and connect it via USB. The tool should detect it, and a progress bar will appear. In the "Download" tab, click the "scatter-loading" button