Think of firmware as the "nervous system" of the head unit. It tells the hardware how to communicate with the screen, how to process audio signals, how to interpret touches on the display, and how to interface with your car’s steering wheel controls.
produced by ZWNAV for various vehicle models, including the Ford Mustang, Dodge Ram, and Range Rover zwnav firmware
Understanding ZWNAV Firmware: A Comprehensive Guide Think of firmware as the "nervous system" of the head unit