Because of the financial turmoil of Fixun Company, all the related apps of Fixun Company have closed down, and naturally they can't be used, including the apps of routers and body fat scales. It cannot be used because there is no server.
Fortunately, there are other apps that can replace the previous Fixun Health, which is to send health. This app can be bundled with Feixun body fat scale to realize some functions of Feixun health.