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Please check if you see your target is being shown in the Target option. Check if you are in KitProg3 DAPLink mode. What is the version of Mbed Studio you are working with? Not sure if that is the reason, but I am working on Mbed Studio 0.8.1 release on Windows 10 and I see the output as shown below:
Please double check if you followed all the steps in the blog. It works for me.
Today it works.
Probably it was some Windows problem preventing COM port to communicate.