App

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Not sure whether this will help, but I had a similar problem and might have accidentally found a simple solution. When I ran the Devialet Expert app on my iPhone, my 440 was not showing up - the app just showed a "busy" symbol in the middle of the display. After turning wi-fi off and on again on the phone, the app found my 440 after a couple of seconds and now seems to be working normally. Strange...