Cannot update beta firmware in MP

I have matekH743Mini with 4.1.0Beta3 firmware installed . Any attempt to update this beta firmware
results in a (failed to find port) error . I have COM and BAUD correctly set and can connect to MP
fine over Mavlink . It asks you to disconnect and then all the different firmware choices appear .
Bottom right is the beta firmware update choice . With COM and BAUD still set on the values I just successfully connected with MP gives this error ?
What “Port” are they talking about ? Otherwise a bug .
MP 1.3.75 Build 1.3.7883.26333

You disconnect, then hit OK, reconnect, it finds the FC and loads the firmware. I just flashed that same Flight Controller.