An FTF file is a proprietary firmware container format used exclusively by Sony devices. Created using Sony's Flashtool (by Androxyde), an FTF bundles the core components of Android: system, kernel, bootloader, and user data.
Removing a lock from a Sony G3312 that you personally own is completely legal. However, using these methods to bypass security on a lost or stolen phone is illegal in most jurisdictions. Sony G3312 Lock Remove Ftf File
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Sony’s lock mechanism is a security feature, not a flaw. Respect privacy and property rights. An FTF file is a proprietary firmware container