For removing the screen lock on a Sony Xperia Z5 Premium Dual (E6833)

FTF stands for Flash Tool Firmware, which is a file format used by Sony to distribute firmware updates for their devices. It's a compressed file that contains the firmware, which can be flashed onto the device using the Sony Flash Tool.

Drivers: Install the Sony drivers found in the Flashtool/drivers folder. Be sure to check the boxes for Flashmode and Fastboot drivers. FTF Firmware18;write_to_target_document7;default0;1e1;

. This process involves flashing a specific "lock remove" FTF or a full stock firmware to the device while it is in Flash Mode Prerequisites Sony Flashtool : Download and install the latest version on your PC. Xperia Z5 Premium drivers are installed (found in the Flashtool/drivers