Cisco Firepower Extensible Operating SystemCisco Fxos 2.3Cisco Nx-os 5.2Cisco Nx-os 6.2Cisco Nx-os 6.3Cisco Nx-os 7.3Cisco Nx-os 8.1Cisco Nx-os 8.2Cisco Nx-osCisco Nx-os 7.0Cisco Nx-os 7.0\\(3\\)i3\\(1\\)Cisco Nx-os 7.1\\(0.1\\)Cisco Nx-os 6.1Cisco Nx-os 2.5Cisco Nx-os 3.0Cisco Nx-os 3.1Cisco Nx-os 3.2