For those of you with AT&T Galaxy S4 SGH-i337 or Sprint Galaxy S4 SPH-L720, we have some good news for you there are stock firmwares now available so you can fully unvoid and unroot your device. There should be more coming for all the other variants such as T-Mobile and Verizon so stay tuned folks. Also, stock firmwares are already available for GT-i9500 and GT-i9505 users at SamFirmware.com.
You can follow our tutorial on How to Root Galaxy S4 and also see our Galaxy S4 stock firmware page for the actual stock firmwares.