First, enter the system environment of "disable driver mandatory signature" and do not search by yourself. Restart the phone startup program. Connect the mobile phone to the computer, open the device manager on the computer, and find the project named KedacomUSBDevice. Reinstall the Oneplus driver. Back to the device manager, I found that the KedacomUSBDevice just now has become an Android device. If the driver is not updated automatically, the problem is solved successfully, otherwise, go to the next step. Double-click oneplusandroidbbotloaderinterface, enter its properties-driver, click the fallback driver, randomly select a reason, and then the solution will be successful as in step 6.