This process will erase all user data on your phone. Additionally, if a Google account was previously signed in, you will still need to verify those credentials due to Factory Reset Protection (FRP) after the reset. Prerequisites Before you begin, ensure you have the following: Computer: A PC running Windows 7, 8, or 10. USB Cable: A high-quality micro-USB cable. Battery: At least 30% battery life on your phone.
If you don't want to deal with manual FTF files, the official Xperia Companion "Software Repair" feature does the exact same thing (reinstalls firmware to wipe the lock) but handles the file downloads for you. sony g3311 lock remove ftf