What happens if you use the standard Lego firmware on your PC do you see the same issues?
Where did you download the Fantom driver from?
Are any of the USB ports on your system USB 3? If so try using a USB 2 port if you have one.
Does the second USB port that you tried (and that worked) now no longer work?
fmbsg wrote:What I find confusing is, that it was possible to flash with USB2 yesterday and since today, the brick is only visible on USB3. I checked all ports: It disappears on all USB2 ports and it shows up on all USB3 ports.
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