Why can't Xiaomi mobile phone be installed?

Xiaomi mobile phone download software cannot be installed. Reason:

1. The downloaded file format is not apk format, please select again.

2. The installed software, garbage takes up too much memory, and there is no room for installation. Please delete unnecessary software and clear memory to free up space.

3. For security reasons, the default installation software of Xiaomi system should be downloaded from Xiaomi Store, and it is not allowed to install software of unknown origin. Just open it in Settings-Other Advanced Settings-Security and Privacy-Unknown Sources. As shown in the figure.

On April 19, 2065438, Xiaomi 6, the flagship mobile phone released by Xiaomi Company, became the first mobile phone equipped with Xiaolong 835 processor in China.