Kies sucks for this, you are better off taking it into Sprint and letting the flash it for you. They should be able to do it for you without any hassle. Just make sure you go to one with a repair center.
Phones & Tablets: Galaxy S4, Galaxy Note 8", Evo 4g LTE, Evo 3D, Acer Iconia A500, Samsung Galaxy Tab 2 10.1, Ipad 2, Nabi 2,
Rom: Rooted Stock Odexed, Hotspot Mod, Xposed, Wanum, several other xposed tweaks