In view of this situation, it is speculated that it may be caused by some problems in Huawei's mobile phone system detection. At present, this problem mainly appears in some Huawei mobile phone models equipped with Android system 6.0.

Temporary solution:

① In Huawei's mobile phone settings, search for "unknown source";

② Click "Unknown Source" to close the installation of external application;

③ Enter Fast Blast, find the game to be installed, click Install, and select "Only this installation is allowed" in the pop-up window that appears.

In the pop-up window of some models, "Open external source application check to identify potential risks" will be selected by default. If you need to uncheck it, click Allow this installation only.