: You will need the specific firmware file for your model. You can often find these through the XperiFirm tool or dedicated Google Drive repositories.
This process will erase all data on the phone, essentially performing a "Master Format". f3311 lock remove ftf
: Ensure your phone has at least 50% charge to prevent a shutdown during the flash. Step-by-Step: Removing the Lock with an FTF File : You will need the specific firmware file for your model