Thanks, I contacted him but he told me that I should first open a tread on your forum.
..so I did

@dc42
Yes, I' dont have "unknown device" or "other devices". Sorry.

@bearer
I also tried using another PC but with the same result.

@dougal1957 Yes, as explained in this tutorial:

https://www.youtube.com/watch?v=TxfEbUuKDyo at 1:20 minute.

This is what is shown under the port com section.

Good evening,
unfortunately I have problems with my Duet wifi card. Given that some time ago I bought a Duet Ethernet card with which I am very well, I decided to buy a Duet wifi from the E3d dealer.
To update the firmware I followed the connection procedure:

https://duet3d.dozuki.com/Wiki/Installing_and_Updating_Firmware

Unfortunately my PC does not recognize the card.
I tried more USB cables (even the one used for the old Duet Ethernet card), but neither the USB device nor the com port are visible.

Having tried everything, I also deleted the existing firmware following the procedure indicated and reinstalled it directly on the Sd Card. Unfortunately the Card is not detected anyway.

The card is under warranty.

Can you help me?
Thank you.