Method 1:

1. The software installation package is damaged, and the phone will prompt that it is not installed

2. Software signature issues are easy to handle if the phone has ROOT. You can download the lucky cracker to crack it (if you don’t have root, you have to give up)

3. The native software of the systems between different mobile phone manufacturers cannot be installed on each other

Method ②:

1. It may be that your memory is not enough. It is recommended to clear the space on your phone before installing it.

2. If there is sufficient storage space but cannot be installed, it is recommended to restart the phone to release part of the storage and then reinstall.

Method 3:

1. Connect to the computer in storage mode or use Root Explorer to find the .android_secure folder in the SD card directory. There should be a smdl2tmp1.asec in it, or it may be Other names, in short, files that are obviously different from the normal program naming format, delete them and try to install the software again.

Method 4:

1. If the installation of the application on the PC fails, please first check whether the USB driver corresponding to the Android phone is installed. Generally, use 91 Mobile Assistant or Wandou The folder will automatically install the mobile phone driver for you.

Method 5:

1. Check whether the phone settings - applications - unknown sources are checked, otherwise some applications not provided by the electronic market will not be installed.

Method 6:

1. Use the system’s own program management to view the programs on the SD card. Some programs do not have colored icons. It turns out that these are software without icons. What's causing trouble is that these software without icons are software data that were not installed correctly or were not completely uninstalled.

Method ⑦:

1. If you install it again, an error will be reported. Now we use the system’s own software management to uninstall them cleanly, and there will be no errors when you install the software again.

The best method:

1. Disable the root software in the settings.

2. In the settings, add the root software and package installer (some machines have a software package installer or an application package installer).

If it doesn't work, you can find the corresponding flash package on the official website (flashing is risky - novices need to be careful)!