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Xiaomi mobile phone installation failed -999
Xiaomi mobile phone installation failed-reason:

1, phone setting problem, enter the phone setting permission to allow installation.

2. If the software is unsigned or the signature is incorrect, just re-sign.

3. The certificate conflicts, so you can only reset it and try again. The specific troubleshooting methods are as follows:

There is a problem with the installation package of 1. software, resulting in an installation error. You can download the complete installation package again. Mobile phone settings do not allow installation packages from unknown sources, just reset them.

2. The lack of storage space in the mobile phone system leads to errors when installing software. You can uninstall the software that is not commonly used on the mobile phone, or use the cleaning tool to clean up the cached data and junk files generated by the system and software to make more system storage space for the mobile phone, and then you can install the software normally.

3. A system problem caused an error when installing the software. You can try to restart the phone or restore the system of the phone to the factory setting.