Video Tutorial: 

Samsung device

1. Tap "Setting"
2. Tap "Developer options"
3. Turn on "Developer options" and "USB Debugging"

HUAWEI

1. Tap "Setting"
2. Tap "About phone"
3. Tap "Build number" for seven times to turn on Developer mode.
4. Back to "Setting" and enter "Developer options"
5. Turn on "Developer options"
6. 6.0 and higher version, please open "Allow ADB debugging in charge only mode" first
7. Turn on "USB Debugging"

Mi device

1. Tap "Setting"
2. Tap "My device"
3. Tap "About phone"
4. Tap the "MIUI version" for seven times to turn on Developer mode.
5. Tap "Developer options"
6. Turn on "Developer options" and "USB Debugging"

The detailed tutorial as follows:

1. Enter "Setting"

 

 

 

 

 

 

 

2. Enter "Setting" - "About phone"

 

 

 

 

 

 

 

3. Tap "Build number" for seven times to turn on Developer mode.

 

 

 

 

 

 

 

4. Back to "Setting" and enter "Developer options"

 

 

 

 

 

 

 

5. Turn on "Developer options" and "USB Debugging"

 

 

 

 

 

 

 

6. Please allow the following options if available "Install via USB" and "USB debugging (security settings)".