The most common way to use an FTF file for lock removal is through the third-party Sony Flashtool Preparation Sony Flashtool
: Flashing a lock removal file or performing a factory reset via FTF will delete all user data , including photos, messages, and apps. f3311 lock remove ftf
: Download the F3311 lock removal .ftf and place it in the firmwares folder of your Flashtool directory. The most common way to use an FTF