When you are connected to the Web UI, you must check the firmware version used by your device by using the online upgrade option in the Web UI. By doing so, the latest firmware version will be installed.
If you have a different version, please refer to the procedure bellow to update your firmware.

 
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You must wait until the update is complete. When upgrading the LEDs of the devices turn blue and the blue light goes from left to right from one icon to the other. Once the update is finished, the icons go back to their previous colour. The update can last up to 5 minutes.