The flash-all-lock.bat file is not downloaded as a standalone utility; instead, it is included within official firmware packages.
To understand the script, you must first understand the concept of "Stock Firmware." When an Android device leaves the factory, it runs the manufacturer's official operating system (the "Stock ROM"). The is a piece of software that loads the operating system. By default, for security, this bootloader is locked , preventing unauthorized software from running. flash-all-lock.bat download