The LEGO MINDSTORMS NXT Firmware Update Mode Windows driver is a specific driver designed for the LEGO MINDSTORMS NXT robot system, particularly when you're performing a firmware update on the NXT brick via a Windows PC. The NXT system is part of LEGO's robotics kits, which allow users to build and program robots. The NXT Firmware Update Mode is a special mode in which the NXT brick enters when you are updating its firmware (the software running on the NXT brick) from a computer.