Arduino Robot not loading

I have an Arduino Robot which I have been using fine for several months with my windows surface pro. Yesterday it stopped loading any new sketches and at the moment is still running the last successful sketch. The error message is as follows:

Connecting to programmer: .avrdude: butterfly_recv(): programmer is not responding

The only thing I remember doing is attempting to adjust the baud rate in the serial monitor as it was loading (may be coincidental), it responded with COM port busy or something.
So nothing has changed, I've checked the setting that I understand and Ive reloaded the IDE with no luck. This thing is my final yeay project and I really need help please.

Kind regards


Maker sure you have selected the correct board and COM port. You can Google that error and try all the simple solutions.

Further info. I have connected to the motor board and successfully loaded the stock firmware