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AWR1642BOOST: My computer cannot detect the serial port!

Part Number: AWR1642BOOST
Other Parts Discussed in Thread: UNIFLASH

I use AWR1642BOOST to run the lab0005-high-accuracy-16xx(the offical demo)

After i finish the flash procedure (use uniflash). Power off the board and remove the jumper from only header SOP2. Then, power on the board, but my computer cannot detect the serial port!

Power supply state, if I press jumper on SOP2, the serial port is displayed.  Why is this?