Android devices are constantly updated, and installation of VPN software may fail. The main reason is that the systems of different manufacturers 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 the 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 the phone;
Find System and Update;
Find Pure Mode;
Click Exit