An FTF file is a type of firmware file used by Sony to distribute software updates for their devices. In this case, the FTF file will be used to remove the lock screen on the SOV33.
When prompted, hold the button and connect the phone to your PC via USB to enter Flash Mode . sony sov33 lock remove ftf top
"Sony SOV33 Lock Remove FTF: A Step-by-Step Guide to Unlocking Your Device" An FTF file is a type of firmware
The FTF top method changes the software lock state but does not rewrite the device’s permanent SIM lock NV item. After a factory reset or OTA update, the lock may return. For a true permanent unlock, consider: sony sov33 lock remove ftf top