well first of all, before you do what mohit378 said which is right, you need to see if it will go into download mode, im not sure the button combo for the s4 so you will have to look that up, then like what mohit378 said your going to need to find a stock your FOR YOUR PHONE MODEL ONLY on sammobile and flash that in odin.
"A man chooses, a slave obeys." - Andrew Ryan
Samsung Galaxy S2
Rom: Cyanogenmod 10.2.1 (4.3.1)
Rom: Cyanogemod 10.1.3 (4.2.2)
Asus Nexus 7
Rom: Stock (4.4.2) Broken Digitizer, any recommendations on amazon?