How to dump system Xperia S?

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http://forum.xda-developers.com – How to dump system Xperia S 6.1.A.2.45 ? The FTF or system.sin I try several techniques, but can not be dump :( Or can someone share of ? I am interested in only Xperia S 6.1.A.2.45: SemcNotes.apk SemcPowerSaver.apk SemcUnplugChargerReminder.apk WeatherWidget.apk Home.apk HomeAdd.apk PowerSaveModule.apk (HowTos)