To update the software of the mesh unit, you must be connected to the web UI.

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Warning: You must update the mesh agents (units that are not connected to the internet router) first andthen the mesh controller (mesh unit that is connected to the internet router through a RJ45 cable).
You must write down the IP addresses of the all the mesh units to be able to connect to the Web UI
of each unit separately.
The new software versions of out products are available here (downloads -> software) :
https://eu.strong-eu.com/downloads/product-downloads/atria-wi-fi-mesh-home-kit-2100/. If the
section is empty it means that there is no update available for the product.

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Warning: Repeat these steps for all the agents and the update the controller.