If code was programmed using an Atmel ICE (or any ISP programmer), that would have erased the bootloader, so that you need to do a "burn bootloader" (or equivalent) (using an external programmer) before you can simply "upload" sketches again.
If code was programmed using an Atmel ICE (or any ISP programmer), that would have erased the bootloader, so that you need to do a "burn bootloader" (or equivalent) (using an external programmer) before you can simply "upload" sketches again.