Yamaha ATS-4080 Owner's Manual page 61

The iOS device does not recognize the
unit when using AirPlay
l The unit is connected to a multiple SSID router.
Access to the unit might be restricted by the network separation
function on the router. Connect the iOS device to the SSID
which can access the unit. (Connect it to the Primary SSID at
the top of the list.)
The MusicCast CONTROLLER app does
not detect the unit
l The unit and mobile device are not in the same network.
Check the network connections and router's settings, and then
connect the unit and mobile device to the same network.
l The unit is connected to a multiple SSID router.
Access to the unit might be restricted by the network separation
function on the router. Connect the mobile device to the SSID
which can access the unit. (Connect it to the Primary SSID at
the top of the list.)
l The wireless (Wi-Fi) connection is disabled.
Enable a wireless (Wi-Fi) connection. For details, see the
following:
– "Enabling/disabling a wireless (Wi-Fi) connection" (p.47)
Firmware update via the network is failed
l It may not be possible depending on the condition of the
network.
Update the firmware via the network again or use a USB
memory device.
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