If you change your mobile device
Set up the Dyson Link app
Download the latest version of the Dyson Link app from your device's app store or marketplace. The Dyson Link App is available on the Apple App Store for iOS devices and the Google Play store.
You will be unable to download the app if you are not running a compatible version of your phone/tablet's operating system.
Open the Dyson Link app.
Sign in to the app and your purifier and settings will be loaded.