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.
"Oh, you can't help that,' said the Cat: 'we're all mad here. I'm mad. You're mad.'
"How do you know I'm mad?' said Alice.
"You must be,' said the Cat, 'or you wouldn't have come here."
Motorola Moto X
Stock KitKat (4.4.2) XT1060
Samsung Galaxy Tab 2 10.1
Rom: Cyanogemod 11 (4.4.4) P5113
Asus Nexus 7
Stock (4.4.2) Broken Digitizer, any recommendations on amazon?
Nikon Coolpix s800c
Stock Gingerbread (2.3.3)