Siemens SIMATIC NET SCALANCE W720 Operating Instructions Manual page 46

Upkeep and maintenance
6.3 Firmware update via WBM or CLI not possible
Result
The firmware is transferred to the device.
Note
Please note that the transfer of the firmware can take several minutes. During the
transmission, the red error LED (F) flashes.
Once the firmware has been transferred completely to the device, the device is restarted
automatically.
46
Operating Instructions, 10/2019, C79000-G8976-C322-11
SCALANCE W760/W720