1. Because the default USB debug mode has been hidden, we have to open it and then open the USB mode, in the mobile phone "application."
2. Select "Set" after we click Enter.
3. Click the "General" tab, as shown in the following figure.
4. Then we'll find "about the device" in the inside and click Enter.
5. Click on the "build number" 7 times until the prompt "developer mode is enabled".
6. After we click on the upper left corner of the "back", you can see the "developer Options", the following figure:
This allows USB debugging to open, if you want to hide we need to restore the factory settings can oh click here to view the Restore factory setting method.
7. Click on "Developer Options" and choose "USB Debugging".
8. Click "OK".
9. At this time "USB debugging" is opened, the following figure:
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Why can't I connect my computer after I turn on USB debugging? This may be a mobile phone driver is not installed or the phone itself USB cable is a bit of a problem, we can test from these two aspects oh.