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IWR1443BOOST: COM PORT issue

Part Number: IWR1443BOOST
Other Parts Discussed in Thread: IWR1443, UNIFLASH, , MMWAVE-SDK

Hi, now I am trying to run the vital sign lab on the IWR1443 Boost Board.

I have installed all softwares needed according to the SDK user guide. When I connect my board, I can see the two port in the device manager.

However, when I try the unflash step, after I add the binary files and choose the right UART port number, 

it alerts "Imaging loading failed:Not able to connect to the serial port, Recheck COM Port selected and/or permissions"

[2019/3/15 上午10:25:05] [ERROR] Cortex_R4_0: Initial response from the device was not received. Please power cycle device before re-flashing.
[2019/3/15 上午10:25:05] [ERROR] Cortex_R4_0: Not able to connect to serial port. Recheck COM port selected and/or permissions.
and i tried  the mmwave_visualizer in the browser, it can detect the COM port but it keeps showing waiting for data 
i make sure that i connect the SOP0 and SOP2 jumper when in flash mode.
Can you help me with this problem?  it has puzzled me about one week!!!!