Do you mean the hammer won't move when you press the keyboard?
Please make sure you have chosen the correct board and COM port while upgrading firmware for Music robot.
Besides, make sure the Musicbot software still says connected to the robot after upgrade firmware.
Also, which kind of battery do you use for the robot kit, please not that you need power the Orion board with 12V power and make sure the power switch on the Board is pulled to on.
Once still the same issue, please take a video for your operation on the Musicbot software and the behave on the Robot.