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MMWAVEICBOOST: My ICBOOST always fails to flash bin file via uniflash

Part Number: MMWAVEICBOOST
Other Parts Discussed in Thread: UNIFLASH, IWR6843ISK

  

This is my ICBOOST connected to IWR6843ISK. I set the SOP 1 0 1 for flash mode and I checked my UART port is com4 but I failed many times to flash bin file via uniflash. It said opening com for com4 and then the error occurred "[ERROR] Cortex_R4_0: Not able to connect to serial port. Recheck COM port selected and/or permissions.". I powered cycle and reset many times it still didn't work.