After continuous updates, Android devices may fail to install VPN software. The main reason is that different manufacturers' systems have enabled authorization restrictions on installed applications, which leads to this situation. Please refer to the following solutions:
Xiaomi mobile phone:
Some Xiaomi devices will prompt as shown below during installation:
Please follow the steps below to complete the settings and install successfully:
Find Settings on your phone;
After finding more settings, find Developer Options;
Turn off the "MIUI Optimization" high-risk function reminder at the bottom of Developer Options;
If there is a prompt to enter a password during installation, please enter your Xiaomi account password
Huawei mobile phone:
Some Huawei devices will prompt as shown below during installation:
Please follow the steps below to complete the settings and install successfully:
Find Settings on your phone;
Find System and Updates;
Find Pure Mode;
Click Exit