1, maybe the phone is not turned on for USB debugging, so it can't be recognized.

Solution: Turn on USB debugging in the phone developer options.

2. If the driver is not installed correctly, the driver is like a switch interface. If it is not installed, the connection cannot be recognized.

Solution: use 360 driver to scan and push storage, and click on the corresponding column to install without driver.

3. The USB power supply in front of the computer is insufficient.

Solution: change the USB interface or plug it into the USB interface behind the computer host.

4. It may be the data cable.

Solution: Check the other data cable. If it works, it means there is something wrong with the data cable, otherwise there is no problem.

5, mobile phone interface problems.

Solution: change a mobile phone interface or maintenance interface.