Nucleo-F446RE board not recognized (anymore) at all (windows). When I plug the USB cable, I get 4 red slow flash then nothing more. How can I reflash or restore the mBed firmware in the nucleo programmer ?

[laurentz]

Yesterday, while debugging in mBed, I experienced strange problems like being unable to debug, unless i unplug and replug the board. Maybe unrelated.

Today, the board is not recognized (USB descriptor problem it seems).