Connection removal

I am not able to disconnect the usb from my wifi moldue

Maybe you have fixed it hard or u may have used another USB cable which is not provided in the boil iot kit.
so may be due to these things you are facing this problem.
I would suggest that please remove the USB cable slowly from the usb pin, remove slowly otherwise the whole kit will be damaged.

You might have fixed it hard and remove the USB Cable slowly from the slot.