Abstract: A fixture, for connecting a host device and a universal serial bus (USB) device, the fixture comprises a plurality of connectors; a plurality of first signal pins, located at first ends of the plurality of connectors for connecting to the host device; and a plurality of second signal pins, located at second ends of the plurality of connectors for connecting to the USB device; wherein a first part of the plurality of connectors are used for transmitting signals between the host device and the USB device in a USB mode; wherein a second part of the plurality of connectors are retained in a specified state for providing a control signal to control the USB device to enter an operating mode.