The plug jack for programming is the 3.5mm on the front. The one on back is for your speaker. Then you should just have to select the right comm' port from the drop down in CHIRP. 

On Wed, Jun 13, 2018, 10:21 Jean-Charles HUILLIER <jchuillier@free.fr> wrote:
Thanks I'll look into it, in fact the plug is on the back on the 50-X2 but 
maybe I didnt plug it all the way.

> The radio end of the cable is a tip-ring-ring-sleeve phone plug.   Just 
> in case you haven’t verified, make sure it seats very firmly in the data 
> jack on the radio's front panel.   I had a similar issue when the cable 
> wasn’t fully seated.   CHIRP couldn’t read the radio’s config.
>
> -Charley   KE4QBW
>
>
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