2. Select the "About Mobile Phone" option in the settings list.
3. After entering the "About Mobile Phone" option, click the "Version Number" several times continuously until the prompt "You are now in the developer mode" appears.
4. Go back to the "Settings" interface, find and click "Developer Options".
5. In the "Developer Options", find and turn on the "USB Debugging" switch.
6. After confirming that "usb debugging" is turned on, you can set the USB connection mode.