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CC2538: issues with flashing using Flash Programmer 2.

Part Number: CC2538

I have two CC2538 boards. I have an image file(.bin extension). I am trying to flash this image. the image is an 6 lowPan serial radio. My windows machine cant see detect any ports that were using COM1. So, I get this error, Connecting Over serial bootloader failed. Unable to open COM1 poert. Error 1.