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My com3 port is used. What happened?
My own solution: If the serial port is plugged in during use, change the newly allocated serial port into the serial port marked in brackets, and click OK to overwrite the serial number.

I don't know what happened to SecureCRT, so com3 became com4, and then I tried several times until com6. According to the above method, it is solved. (system win7)

I wonder how others will solve it.