Hi, I would give the board one more chance doing it the way I used. Download the little programm I made to set the board in a defined condition.
Deploy and start this program. When you are asked to press the button (output window) → press BTN1. Now your board is in a defined defined condition for updating the Wifi
Module. Repower the board and disconnect it again. Then apply the 4 cables as can be seen on the picture on my repo. Then plug in the 2 USB connectors. Open STMFlashLoaderDemo and select the proper COM port and 115200 baud rate. Press BTN1, then click Next. When it doesn’t connect pull the USB connector of the FEZ board and push it in again. Then click Next again and you should go.
Edit: Forgot one step (second press BTN1), is included now.