When I used my millet 3 used in high school to debug Android applications, I always had the following picture.

Because it has been known that the urine of millet, brush machine, root developers have to choose 8 seconds allowed.

So at the very beginning, USB debug, USB installation and FASTBOOT brush machine were opened, but the above situation still appeared.

Through the search of the web site that does not exist, it turns out that it was in the developer's option. MIUI optimization In trouble (ten thousand CNM in his heart)

Resolvent

Developer Options > MIUI optimization (off)

You can solve the problem that can not be installed.