I've rebooted everything, got rid of, and then reinstalled the app. Turned off and on bluetooth. But when I try to pair with controller over bluetooth I get the same message "cannot connect" I've tried everything in the trouble shooting manual! The professional I bought the used system from says "it's a mystery" and Victron says they don't deal with end users. And the solar doesn't even show up in my devices list (just the controller). Can anybody help??? TIA I'm using an iPhone 11.