Scroll to the bottom of the ports listing and use USB0. Worked for me with a similar issue. 

On Sun, Mar 29, 2020, 16:11 <w4rss@radioclub.org> wrote:

I hauled out my FT-7100 and thought I'd give CHIRP a try for 
programming it since it's no in the list of supported radios.

Everything went smoothly until I tried to connect to the radio.  I'm 
using a Tripp-Lite USB to Serial adapter and my Win10 machine shows in 
on port 10.

When trying to upload a newly edited copy of an old .eep file, I 
eventually receive a message that says it can't connect to the radio.

Looking for troubleshooting ideas.

Dick
W4RSS


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