Huawei mate20 HarmonyOS system, as long as you open any software, it will get a black screen and restart.

1. First of all, Huawei mate20 HarmonyOS system appears in the process of using mobile phones. Any software that is opened will get stuck in the black screen, so restart. You need to clear the cache and data of the application, enter the setting interface of the mobile phone, select the application manager, find the failed application, clear its cache and data, and reopen the application to see if it can run normally.

2. Secondly, uninstall and reinstall the application to clear the cache and invalid data. You can try to uninstall the failed application and re-download and install it in the app store.

3. Finally, update the system and application. The mobile phone has been updated to the latest version of the system and application, but there are still some faults such as black screen. Users need to contact Huawei customer service staff for more detailed troubleshooting and solutions.