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CCS/IWR1642: IWR1642 cannot connect to the emulator downloader

Part Number: IWR1642

Tool/software: Code Composer Studio

TI engineers, I have designed a board separately using IWR1642, and now I can't download the program. What is going on? I want to download the xwr16xx_ccsdebug.bin file through the serial port first, but after downloading a bit, the download progress bar will not move, as shown in the picture below. What is going on?

The serial port recognized by my computer and the IWR1642 DEMO board are different from the serial port recognized by USB. My serial port is such a USB Serial Port (COM66), and the serial port number of the DEMO board is such an XDS110 Class Application/User. UART
Is my serial port identification correct? What do I need to pay attention to when downloading a program or online emulation via an external emulator? What should I pay attention to during the schematic design process? And when I connect the DSP core downloader now I get the following error:
CS_DAP_0: GEL Output: --->> DSS is under application controlled reset. Prior to connecting this reset must be released.
CS_DAP_0: GEL Output: --->> The debugger will enable "Halt On Reset" and release the application-extended reset
C674X_0: GEL: Error while executing OnPreTargetConnect(): GEL_SetWaitInResetMode(): target does not support halt on reset
At GEL_SetWaitInResetMode(1)
At GEL_EvalOnTarget("C674X_0", "GEL_SetWaitInResetMode(1)") [xwr16xx_dss_csdap.gel:164]
At DSS_PreConnect_CheckResetStatus()
At GEL_EvalOnTarget("CS_DAP_0", "DSS_PreConnect_CheckResetStatus()", 1) [xwr16xx_dss_init.gel:11]
At OnPreTargetConnect()
C674X_0: Error connecting to the target: (Error -1180 @ 0x0) Device is held in reset. Take the device out of reset, and retry the operation. (Emulation package 8.0.27.9)

I want to download the program correctly. What are the settings for the IWR1642 working mode or the IO settings? If the wrong design is wrong, it will not be able to download the program?
Do I have to download the xwr16xx_ccsdebug.bin file when I first use the IWR1642 chip?



How can I solve this? Please advise, thank you