or airOS 3.x/4.x firmware available in the airMAX Legacy section .
provides the most recent firmware (airOS) for NanoStation models including M5 and 5AC. or airOS 3
: If your query refers to Scanning Electron Microscope (SEM) control, Coxem Nano-station 4.0 is the dedicated software suite. airMAX - Software Downloads - Ubiquiti or airOS 3
: The official Ubiquiti Download Center