You will need to reflash Samsung official firmware on the phone. Since the phone is in bricked state you will not be able to backup the phone.
http://updato.com/how-to/how-to-install-an-official-samsung-stock-firmware-using-odin
Follow this guide and make sure you try flashing home_csc first instead of CSC to avoid factory reset unless it's needed.
You will need to hold volume down + power + home until you get the download mode prompt screen
Same keys, volume up if you want to boot recovery.
Same keys volume down if you want to force shut off phone when holding it for longer.