What if the Android phone doesn't connect to the computer?

1, Android Phone we click "Settings", as shown in

2, and then found in the settings "developer Options" (some mobile phone is developed, Android 4.0+ version is clicked on the phone version of a few consecutive will appear)

3, after entering the USB debugging, we check it

4, now we install a 360 mobile phone assistant in the computer, and then connect the mobile phone with the computer, then 360 will help you to install the mobile phone to remind you that the phone connected to the computer successfully.