If you are using ThinOS 8, then you can simply use INI parameters to tell the client which WMS server to use.
With ThinOS 9 you can use the WMS policy under Services. Make sure to just use this part of the policy only when you really want to move a client!
Some devices we want to migrate have an old firmwa 8.4 / 8.5 and the WMS is now on Version 3.
Are there any known issues that this devices can’t connect to a newer WMS? It’s the same system, only that the devices weren’t used over 100 days and more and the customer updated the WMS from 1.X to 3 so we can migrate on the same base.