wf121 gui does not reattach autimaticly after reset that sent over usb.
we activated usb on wf121 board we did not recognize that uart would disable after upgrade .
now we can communicate over usb but when we try to boot in dfu mode, the board reset and does not reattach
we use standalone wf121.
When you reset over USB it resets the whole module so the USB COMPort will re-enumerate. On the host side you need to close the COMPort as quickly as possible because if it module USB interface re-enumerates while the COMPort is open you won't be able to attach without removing the USB connection.