Modern Flashtool (0.9.x+) dropped support for very old Xperia devices (Android 2.3–4.0). Version 0.6.9.1:
Security researchers have identified multiple campaigns using this exact filename pattern. Analysis of submitted samples to services like VirusTotal shows that Flashtool_0.6.9.1.epub is often a or an InfoStealer . Flashtool 0.6.9.1.epubl