It might not be a firmware issue as the firmware had not needed to be updated for some time now. However once you have the USB device you will be able to connect to your PC to calibrate them that way which might be easier.
Otherwise is there any change you are using the ESC with a pixhawk system? If so you probably want to update the firmware to a pixhawk specific firmware which you can download here - Quattro ESC enters programming mode with Pixhawk - #2 by unmannedtech1
Hope that helps.