gt2560+a4988 geeetech prusa i3 x 3d printer

hi hope you can help me please I am trying to upload new firm wear to my 3d printer mother board gt2560 +a4988 stepper motor drivers but when doing so my arduino comes up with unable to upload com 3 fault have used tool window and it states com 3 busy can you help please thanks peter burgess

Have you checked to see if your PC considers your Arduino to be connected to COM3 ?

This really sounds like a question to be addressed to whoever created the software you want to upload.