1. Make sure to use the latest version of the flush software: go to official website or the app store to update to the latest version.

2. Check the network connection: unstable or disconnected network connection will affect the use of software functions.

3. Clear the cache and data: Find the flush software in the application manager, clear the application cache and data, and check the settings.

4. By setting on or off: in the setting interface, look for options related to the K-line diagram to ensure that it has been turned on.