Just set it in the mobile phone security settings. This is also an option added by operators to ensure that users will not install unofficial applications indiscriminately, resulting in disorder of mobile phone systems.

Solution: Open an application that allows the system to install an unknown source.

2. System version reason

Because the update of the system will bring many new interfaces and changes, some new software versions do not support the old version of the system or do not know the old version of the hardware.

Solution: Upgrade the mobile phone system to the latest version.

3. Other issues

Sometimes when downloading software, the corresponding software is not downloaded according to the model of the mobile phone. If the software does not support the phone model, you cannot install the software. At this time, you just need to download the software that supports the mobile phone model.

Also, when installing mobile phone software, if there is an old version of this software in the mobile phone, it is a software installation error. At this time, uninstall the old version of the software and install the new software.

Extended data:

Common troubleshooting of mobile phones:

Symptoms: There is something wrong with the software prompt parser installed on the mobile phone.

1. The installation package may be damaged during the downloading of mobile phone software. You can delete it, clean it, and then download and install it again.

2. If the analysis package error is prompted after installation, the most likely reason is that the required version of the mobile phone software is higher than the current mobile phone. For example, if the software requires more than 4.3 and the mobile phone version is 4.2, you will be prompted to analyze the package error. You can check the system version on your mobile phone.

3. Version history. Whoever installed the mobile phone software can look up the version history of the software on the Internet and find that the version to be installed corresponds to the version of the mobile phone or is lower than the version of the mobile phone system, so that it can be installed and used.

4. Sometimes the version history can't meet the requirements, so you need to upgrade the mobile phone version. You can find the brush package of the corresponding mobile phone online, pay attention to whether the system version is appropriate, and you can install the software after brushing.

5, path and file name problems

The current device does not support Chinese names or paths, nor does it support long file names.

Solution: Rename the file, and the name only contains English letters (but pay attention to the suffix). "apk" should be kept), if it is renamed as "abc.apk", then move the installation program after the change is completed.