While it can switch custom ROMs back to official software, it typically cannot re-lock an unlocked bootloader. User Experience Reviews from community forums like SonyXperia on Reddit
This build is often cited as a "top" choice for legacy devices because:
in Windows settings before the drivers will install correctly. 2. Setting Up Firmware Firmware Files : Download the appropriate firmware file for your specific device model and region. : Move the file into the C:\Flashtool\firmwares folder so the application can detect it. 3. Flashing Process Launch Flashtool : Open the application (use FlashTool64.exe for 64-bit Windows). Select Flash Mode : Click the lightning bolt icon and select Choose Firmware