You will need to put the Netduino 3 WiFi into DFU mode and change the product type and then re-flash the firmware:
• Hold down the reset button and connect the Netduino 3 WiFi board to the USB port on your computer.
• Open the Netduino Updater application
• If the Updater states that the board is a WiFi board then simply deploy the updated firmware
• If the board is listed as Netduino 3 or STM Device in DFU Mode then click the Options link, This will open a new dialog box showing the product type and you can change this here. Click the Change link under the dropdown box. This will allow you to select the new product type. Note that this information is written into programmable memory and can only be changed so many times before it is fixed.
@Brijesh_Singh - you may need to follow this advice as well.
Let us know how you get on.