MSP-EXP432E401Y: connection can't be detected

Part Number: MSP-EXP432E401Y
Other Parts Discussed in Thread: BP-DAC11001EVM,


I'm using the BP-DAC11001EVM and MSP-EXP432E401Y Launchpad. 

I followed the instructions in BP-DAC11001EVM user's guide to update the MSP-EXP432. The connection and update seem successful, as the pictures show below.

However, when I switched the usb cable to U7, nothing was detected.

Other information: The green LED did turn on when usb is connected at U7. 3V3 and 5V pin are at correct voltages. PC OS is win10.

I've also tried another PC, but the issue remains.